Issue #3224421 by ankithashetty, daffie, andypost, longwave, alexpott, xjm: [PHP 8.1] Add a shim to Guzzle 6 for PHP 8.1 compatibility

Issue #3232691 by alexpott, longwave: Refactor \Drupal\Core\Ajax\AjaxHelperTrait to not cause deprecations in PHP 8.1

Issue #3213295 by effulgentsia, tedbow, longwave, Spokje, xjm, catch: Update Symfony 5 components to 5.3-rc1

Issue #2844452 by Eduardo Morales Alberti, longwave, andypost, Wongjn, sanjayk, geek-merlin, ayushmishra206, Hardik_Patel_12, alexpott, catch, DamienMcKenna, dww, anruether, dawehner, jrockowitz: Export configuration YAML strings as multiline

Revert "Issue #2844452 by Eduardo Morales Alberti, longwave, andypost, sanjayk, geek-merlin, ayushmishra206, Hardik_Patel_12, alexpott, DamienMcKenna, dww, anruether, dawehner, jrockowitz: Export configuration YAML strings as multiline"

This reverts commit 677700aa.

Issue #2844452 by Eduardo Morales Alberti, longwave, andypost, sanjayk, geek-merlin, ayushmishra206, Hardik_Patel_12, alexpott, DamienMcKenna, dww, anruether, dawehner, jrockowitz: Export configuration YAML strings as multiline

Issue #3198594 by catch, longwave, nikitagupta, alexpott, andypost: Forward compatibility layer for InputBag

Issue #3192842 by gabesullice, xjm, phenaproxima, lhockley, thalles: Make our README more welcoming by converting it into an "entrypoint" into the Drupal ecosystem

SA-CORE-2021-001 by larowlan, stephenacrossri, siliconmeadow, mcdruid, xjm, vijaycs85, mlhess, greggles

Issue #3098281 by greg.1.anderson, alexpott, heddn, Mile23, xjm, jungle, longwave: Ensure that 'composer update' evaluates dependencies using the correct PHP version

Issue #3151118 by alexpott, Beakerboy, kapilkumar0324, anmolgoyal74, jungle, heddn, Mile23, andypost, daffie: Include bootstrap.inc using composer

Issue #3128631 by andypost, longwave, hussainweb, ayushmishra206, greg.1.anderson, xjm, catch, Mixologic, jungle, Gábor Hojtsy: Update dependencies composer/composer ^2 and composer/semver to ^3

Issue #3111409 by mherchel, proeung, larowlan, alexpott, lauriii, Gábor Hojtsy, andrewmacpherson, catch, xjm, andypost, rahulrasgon, rabbitlair, mrconnerton, poojakural, boulaffasae, jerseycheese, shimpy, Indrajith KB, DuneBL, kiran.kadam911, komalkolekar, keboca, hawkeye.twolf, andrewozone, Maithri Shetty, alexdmccabe, sd9121, Sreenivas Bttv, katannshaw, mgifford, nod_, webchick, mtift, rainbreaw, Berdir, brianperry, thejimbirch, Dom., q0rban, nitesh624, hansa11, himanshu_sindhwani, kostyashupenko, shaktik, bnjmnm, sharma.amitt16, sonam.chaturvedi, steinmb, shaal, ressa, Ramya Balasubramanian, Sebacic, pradeepjha, tanmaykadam, thedrupalkid, vinitk, volkswagenchick, viappidu, vebrovski, Ujval Shah, Webbeh, Yuri, trebormc, msuthars, mrinalini9, bash247, chetanbharambe, ellenoise, anevins, andriyun, CocoM, JayKandari, ambuj_gupta, hussainweb, jhodgdon, Pooja Ganjage, ju.vanderw, jwitkowski79, MaxPah, Lokender Singh2, jponch, KarenS, KarinG, Lal_: Add new Olivero frontend theme to Drupal 9.1 core as beta; later make it stable and the default

Issue #3064854 by markcarver, andypost, johnwebdev, lauriii, ridhimaabrol24, Hardik_Patel_12, Charlie ChX Negyesi, jhodgdon, aleksip, alexpott, Fabianx, Chi, Wim Leers: Allow Twig templates to use front matter for metadata support

Issue #3123326 by Neslee Canil Pinto, longwave, Berdir: Remove pathauto version check from 9.0, no incompatible version is Drupal 9 compatible

Issue #3043471 by longwave, catch, Wim Leers, xjm: Replace the DiactorosFactory message factory in symfony/psr-http-message-bridge with a PSR-17 compliant message factory

Issue #3020296 by alexpott, longwave, bradjones1, catch, Berdir, gapple: Remove Symfony's classloader as it does not exist in Symfony 4

Issue #3110862 by longwave, alexpott, catch, Mile23, Lendude, Gábor Hojtsy, Berdir: Remove simpletest module from core

Issue #3104354 by longwave, TravisCarden, xjm, catch, alexpott, Wim Leers: Update Laminas components including Diactoros

Issue #3106075 by Krzysztof Domański, heddn, Gábor Hojtsy, xjm, catch, mondrake, larowlan, greg.1.anderson: Bump minimum PHP for Drupal 9 to PHP 7.3

Issue #3104015 by TravisCarden, alexpott, longwave, Spokje, fgm, catch, xjm, Berdir, Bruno Vincent: Replace ZendFramework/* dependencies with their Laminas equivalents

Issue #3104265 by longwave, catch, xjm, TravisCarden: Update Composer dependencies on Doctrine components in 9.0.x

Issue #3104473 by Manuel Garcia, Mile23, greg.1.anderson, longwave, xjm: Use version of guzzlehttp/guzzle ^6.5.2

SA-CORE-2019-012 by samuel.mortenson, larowlan, pwolanin, Sam152, Jasu_M, David_Rothstein, michieltcs, Ayesh, alexpott, xjm, vijaycs85, mcdruid

Issue #2901363 by alexpott, Mile23, shubham.prakash, prithvi1972, Jaesin, cilefen, borisson_, runeasgar: Move easyrdf/easyrdf to require-dev

Issue #3084983 by plach, amateescu, catch, Berdir, xjm: Move all the code related to path aliases to a new (required) "path_alias" module

Issue #3041076 by alexpott, shaal, Gábor Hojtsy, lauriii, Wim Leers, catch, Cottser, jibran, andypost, znerol, xim, joelpittet, effulgentsia: Update Drupal 9 to Twig 2

Issue #3087531 by alexpott, jibran, gnikolovski, xjm, Mixologic: Use Diactoros LTS version 1.7, not 1.8 which is out of security coverage