Merge branch '6.2' into 6.3

* 6.2:
  [Translation][Mailer] Convert `$this` calls to static ones in data providers
  [BC Break] Make data providers for abstract test cases static
  use TestCase suffix for abstract tests in Tests directories
  Fix Request locale property doc types
  [DependencyInjection] Fix autowire attribute with nullable parameters
  Bump absolute lowest dep to 4.4
  remove not needed PHP version switch

Author: nicolas-grekas

Tests/LinkedInTransportFactoryTest.php

@@ -21,26 +21,26 @@ public function createFactory(): LinkedInTransportFactory
         return new LinkedInTransportFactory();
     }
 
-    public function createProvider(): iterable
+    public static function createProvider(): iterable
     {
         yield [
             'linkedin://host.test',
             'linkedin://accessToken:UserId@host.test',
         ];
     }
 
-    public function supportsProvider(): iterable
+    public static function supportsProvider(): iterable
     {
         yield [true, 'linkedin://host'];
         yield [false, 'somethingElse://host'];
     }
 
-    public function incompleteDsnProvider(): iterable
+    public static function incompleteDsnProvider(): iterable
     {
         yield 'missing account or user_id' => ['linkedin://AccessTokenOrUserId@default'];
     }
 
-    public function unsupportedSchemeProvider(): iterable
+    public static function unsupportedSchemeProvider(): iterable
     {
         yield ['somethingElse://accessToken:UserId@default'];
     }