Merge branch '5.0' into 5.1

* 5.0:
  Parse and render anonymous classes correctly on php 8
  Enable APCu for the php 8 build.
  [Process] Fix failing test on php 8.
  [HttpKernel] fix test
  Make PHP 8 green on Travis
  Revert "[Cache] allow DBAL v3"
  [PropertyAccessor] Added missing property path on php 8.
  Don't execute tests with DBAL 2.x on php 8.

Author: nicolas-grekas

composer.json

@@ -17,6 +17,7 @@
     ],
     "require": {
         "php": ">=7.2.5",
+        "psr/log": "^1.0",
         "symfony/polyfill-php80": "^1.15"
     },
     "conflict": {