Issue #3063887 by mondrake, alexpott, longwave, catch, xjm: Support PHPUnit 8 in Drupal 9, drop support for PHPUnit 7

Issue #3113476 by alexpott, mpdonadio: Fallback when request is not available on the stack in Time service

Issue #3112642 by dhirendra.mishra, Hardik_Patel_12, alexpott: Remove all @deprecated code from menu_link_content module

Issue #3088077 by Sam152, bkosborne, rensingh99, tim.plunkett: Layout builder does not correctly bubble up cache metadata for empty blocks

Issue #3111645 by bobbygryzynger, catch: Uninstall entity_reference module and prevent it being enabled again, remove deprecated code

Issue #3089206 by DamienMcKenna, Wim Leers, ravi.shankar, mr.baileys: Add "protocol version" cache context to allow optimizing responses for HTTP/1 vs HTTP/2

Issue #3111729 by bnjmnm, prabha1997, ravi.shankar, dww: Stable templates/CSS that differ only in comments or indentation should match core's version

Issue #3111906 by himmatbhatia, alexpott, swatichouhan012, longwave: Remove deprecated AllowedTagsXssTrait

Issue #3112829 by alexpott: Fix fails due to Generic.CodeAnalysis.EmptyPHPStatement.SemicolonWithoutCodeDetected due to recent dependency updates

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

Issue #3111658 by Deepthi kumari, kiamlaluno: editor_field_formatter_info_alter() is wrongly reported to be an implementation of hook_form_FORM_ID_alter()

Issue #2871374 by mondrake, daffie, bohart, catch: SelectTest::testVulnerableComment fails when driver overrides Select::__toString

Issue #3092209 by jibran, ravi.shankar, catch, Mile23: Update PHP version for drupal/core-project-message

Issue #2928906 by tstoeckler, hchonov, gnunes, gease, amateescu, daffie, alexpott, catch, claudiu.cristea: The field schema incorrectly stores serial fields as int

Issue #2809237 by dmitryl, alexpott, iampuma, muschpusch, louisnagtegaal, twfahey, aburrows, Mike Lewis, nickmans, borisson_, jcnventura: Properly deprecate AllowedTagsXssTrait

Issue #3111865 by ravi.shankar, Hardik_Patel_12, longwave: Remove all @deprecated code from media_library module

Issue #3111888 by andypost, Hardik_Patel_12, Gábor Hojtsy: Remove all @deprecated code from Phpstorage and Version Components

Issue #3086644 by Mile23, alexpott, Mixologic, greg.1.anderson, jibran: LegacyProject composer templates wrongly reference 8.x + fix test coverage

Issue #2831065 by andypost, alexpott, mpdonadio, longwave, Berdir: Remove BC layer from \Drupal\Core\DrupalKernel::getInstallProfile()

Issue #3105977 by Hardik_Patel_12, pratik_kamble, longwave, pandaski: Remove unused variable from block module

Issue #3108252 by pratik_kamble, Hardik_Patel_12, rogerpfaff, nishantghetiya: Remove unused variables from layout builder module

Issue #3106272 by pratik_kamble, Hardik_Patel_12, longwave, naresh_bavaskar: Remove unused variable from DateFormatFormBase

Issue #3111373 by Gábor Hojtsy, andypost: Remove deprecated migrate plugins from non-migrate modules

Issue #3110315 by Hardik_Patel_12, Gábor Hojtsy, andypost, longwave, mpdonadio: Remove all @deprecated code from migrate_drupal module

Issue #3110583 by govind.maloo, init90: Remove @todo - Use Url::fromPath() once https://www.drupal.org/node/2351379 is resolved

Issue #3107006 by Rangaswini, Hardik_Patel_12, hash6: Remove unused variable from media.module and from UrlResolver.php files