Merge branch '6.4' into 7.0

* 6.4:
  Sync .github/expected-missing-return-types.diff
  [WebProfilerBundle] Fix the design of the compact toolbar button
  [AssetMapper] Improve link generation script
  fix merge
  consistently use dates in UTC in Doctrine connection tests
  Add missing Chinese(zh_TW) translations
  [Intl] [Emoji] Fix emoji files (remove wrong characters / add missing data)
  [Translation] Crowdin Bridge: use the project language mapping
  [VarExporter] Nitpicking in README.md
  [DoctrineBridge] Adapt deprecation message to include ODM bundle attribute name
  Added missing Serbian (sr_Cyrl) translation
  [Validator] Add missing Serbian translation
  [Validator] Add missing arabic translation
  [Validator] updated Albanian translation
  [Clock] Fix calling `mockTime()` in `setUpBeforeClass()`

Author: nicolas-grekas

Resources/views/Profiler/toolbar.css.twig

@@ -47,6 +47,8 @@
 }
 
 .sf-minitoolbar {
+    --sf-toolbar-gray-800: #262626;
+
     background-color: var(--sf-toolbar-gray-800);
     border-top-left-radius: 4px;
     bottom: 0;
@@ -66,6 +68,8 @@
 }
 .sf-minitoolbar svg,
 .sf-minitoolbar img {
+    --sf-toolbar-gray-200: #e5e5e5;
+
     color: var(--sf-toolbar-gray-200);
     max-height: 24px;
     max-width: 24px;