(cherry picked from commit 287cbe29)

Issue #3135302 by longwave, Kristen Pol: Remove Symfony 3 legacy test from ReverseProxyMiddlewareTest

(cherry picked from commit 39bd4196)

Issue #3119733 by Raunak.singh, Suresh Prabhu Parkala, daffie, bertboerland, Kristen Pol, xjm: COPYRIGHT.txt outdated

(cherry picked from commit b1d0cab0)

Issue #3135629 by alexpott, dww, daffie, jungle, Rkumar, balsama, xjm: Minimum MySQL version requirement is not confirmed when upgrading existing sites from Drupal 8 to Drupal 9

(cherry picked from commit cefc84f9)

Issue #3123537 by tedbow, dww, DamienMcKenna, xjm, Berdir, tim.plunkett, pingwin4eg: /admin/reports/status should not WSOD if it finds an extension missing core_version_requirement in its info.yml file

(cherry picked from commit 1b4c4238)

Issue #3134459 by ridhimaabrol24, aleevas, longwave, heddn, quietone, xjm: Remove @group legacy from migrate tests

(cherry picked from commit 15c4512b)

(cherry picked from commit 2838d78e)

Issue #3135308 by sja112, longwave, Kristen Pol: Fix 'The "Symfony\Component\BrowserKit\Response::getStatus()" method is deprecated since Symfony 4.3, use getStatusCode() instead.'

(cherry picked from commit ef61d276)

(cherry picked from commit 5c72f9f0)

Issue #3133305 by quietone, xjm, daffie, benjifisher, longwave: Use \Drupal::VERSION to get the version in Migrate UI rather than hardcoding it

Revert "Revert "Revert "Issue #3133305 by quietone, daffie, xjm, benjifisher, longwave: Use \Drupal::VERSION to get the version in Migrate UI rather than hardcoding it"""

This reverts commit 868ae52e.

Revert "Revert "Issue #3133305 by quietone, daffie, xjm, benjifisher, longwave: Use \Drupal::VERSION to get the version in Migrate UI rather than hardcoding it""

This reverts commit 6704a2f3.

Revert "Issue #3133305 by quietone, daffie, xjm, benjifisher, longwave: Use \Drupal::VERSION to get the version in Migrate UI rather than hardcoding it"

This reverts commit 7dabc937.

Issue #3133305 by quietone, daffie, xjm, benjifisher, longwave: Use \Drupal::VERSION to get the version in Migrate UI rather than hardcoding it

(cherry picked from commit 4d49b849)

(cherry picked from commit 705ab0ab)

Issue #3134606 by greg.1.anderson, longwave, Kristen Pol, catch, jungle, alexpott: PHP Fatal error in 8.9.x / 9.0.x upgrade path

(cherry picked from commit 90af0a65)

Issue #3134648 by alexpott, dww, greg.1.anderson, hussainweb, catch, xjm: Don't pin the composer/installers version in drupal/core-recommended

Issue #3131343 by mondrake, dww, jungle: Replace assertions involving calls to in_array() with assertContains()/assertNotContains()

(cherry picked from commit 421c588c)

Issue #2946073 by claudiu.cristea, mpp, neclimdul, Berdir, idimopoulos, remkoklein: Node grant access check missing cacheable dependency on node

(cherry picked from commit 6685ea27)

Issue #3101635 by mrinalini9, TylerMarshall, Kristen Pol: Update comments in taxonomy.es6.js to reflect taxonomy and not blocks

(cherry picked from commit 5c2f38aa)

Issue #3126906 by jungle, longwave, AndyF: MenuLinkContentTest.php is recognized as a binary file by git

(cherry picked from commit 7590d5b5)

Issue #3133604 by Berdir, dww: Dependency compatibility check in system doesn't check if version is defined

(cherry picked from commit 4da7958d)

(cherry picked from commit da4caf4f)

Issue #3134333 by xjm, longwave, ravi.shankar, daffie: Change Drupal\Tests\search\Functional\SearchSimplifyTest and Drupal\Tests\search\Functional\SearchTokenizerTest to kerneltests

(cherry picked from commit 84f3be3d)

Issue #3087465 by zuhair_ak, tim.plunkett, Kristen Pol: Move hook_views_ui_display_top_links_alter() to views_ui.api.php

(cherry picked from commit 8a8be6cc)

(cherry picked from commit a71b6415)

Issue #3134475 by Beakerboy, daffie: Avoid directly comparing string to blob in CommentIntegrationTest

(cherry picked from commit 9d884951)

Issue #3130341 by jungle, longwave, catch, xjm: [backport] Remove Drupal\Core\Update\UpdateKernel::fixSerializedExtensionObjects()

Issue #3114122 by jungle, klausi, dww: ExceptionLoggingSubscriber should log 403 access denied reason

(cherry picked from commit 5fbd9c79)

Issue #3121020 by dww, Kristen Pol: Move Update Manager XML test fixtures into a fixtures/release-history directory

(cherry picked from commit 7255efdd)

Issue #2988309 by Krzysztof Domański, Berdir, hchonov: Ensure that all field types return TRUE on equals() for the same values

(cherry picked from commit 29e32469)

Issue #3106304 by huzooka, Wim Leers: Migrate: add mapping for editor module's editor_align and editor_caption filters

(cherry picked from commit 683ed03e)

Issue #2907402 by Berdir, neel24, Wim Leers, damiankloip, tedbow: HAL normalization of file fields don't provide file entity id or file entity REST URL

(cherry picked from commit df127208)

Issue #3101891 by tim.plunkett, zrpnr: Allow layout plugins to define default values for column widths

(cherry picked from commit 5777f8f5)

Issue #3110620 by salah1, xjm, kiamlaluno: Documentation for ModuleHandler::invokeAll() says the method uses a PHP function that is not used anymore

(cherry picked from commit 12610fd5)

Issue #3126965 by jungle, quietone, longwave, mondrake, dww: Replace assert* involving count() and an integer literal with assertCount()

(cherry picked from commit 40a5bd7e)

Issue #3094398 by martin107, alexpott, andypost, klausi: Update Symfony response and request events to new classes

(cherry picked from commit ca1aa9e4)

Issue #3107472 by ravi.shankar, alexpott, kishor_kolekar, jibran: DbDumpCommand should not hardcode the version string

(cherry picked from commit 4276e511)