Merge branch '6.4' into 7.0

* 6.4:
  Fix CI
  [Translation] Prevent creating empty keys when key ends with a period
  #51928 Missing translations for Belarusian (be)
  [DoctrineBridge] Spread some PHP 8 love
  [Cache] Fix leftovers in generated Redis proxies
  [Cache] Add missing `@requires extension openssl`
  [Validator] Update Slovenian translations (sl)

Author: derrabus

Tests/Mime/BodyRendererTest.php

@@ -133,6 +133,9 @@ public function testRenderedOnceUnserializableContext()
         $this->assertEquals('Text', $email->getTextBody());
     }
 
+    /**
+     * @requires extension intl
+     */
     public function testRenderWithLocale()
     {
         $localeSwitcher = new LocaleSwitcher('en', []);