Merge branch '6.2' into 6.3

* 6.2:
  minor #49253 [PHPUnit 10] Use `TestCase` suffix for abstract tests in `/Tests/` (OskarStark)
  [Intl] Generate all emoji short name returned by slack api
  [Serializer] Fix CsvEncoder decode on empty data
  [Tests] Migrate data providers to static ones
  stop using assertObjectHasAttribute()/assertObjectHasNotAttribute()
  [Cache] Fix Redis proxies
  [Dotenv] Fix phpdoc Dotenv
  [Config] Fix phpdoc nullable
  Replace deprecated/removed way to configure enabled_locales
  fix typo
  Fix some typos

Author: nicolas-grekas

Tests/ParserTest.php

@@ -126,14 +126,14 @@ public function testSpecifications($expected, $yaml, $comment)
         $this->assertEquals($expected, var_export($this->parser->parse($yaml), true), $comment);
     }
 
-    public function getDataFormSpecifications()
+    public static function getDataFormSpecifications()
     {
-        return $this->loadTestsFromFixtureFiles('index.yml');
+        return self::loadTestsFromFixtureFiles('index.yml');
     }
 
-    public function getNonStringMappingKeysData()
+    public static function getNonStringMappingKeysData()
     {
-        return $this->loadTestsFromFixtureFiles('nonStringKeys.yml');
+        return self::loadTestsFromFixtureFiles('nonStringKeys.yml');
     }
 
     /**
@@ -2401,7 +2401,7 @@ public function testParsingIniThrowsException()
         $this->parser->parse($ini);
     }
 
-    private function loadTestsFromFixtureFiles($testsFile)
+    private static function loadTestsFromFixtureFiles($testsFile)
     {
         $parser = new Parser();