Issue #3267870 by heddn, Fabianx: Order image mappings by breakpoint ID and numeric multiplier

core/modules/breakpoint/src/BreakpointManager.php

...modules/responsive_image/responsive_image.post_update.php

...ules/responsive_image/src/Entity/ResponsiveImageStyle.php

...les/responsive_image/src/ResponsiveImageConfigUpdater.php

...update/responsive_image-order-multipliers-numerically.php

...sponsive_image/tests/fixtures/update/responsive_image.php

.../ResponsiveImageOrderMultipliersNumericallyUpdateTest.php