Merge branch '5.4' into 6.2

* 5.4:
  [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
  Bump absolute lowest dep to 4.4

Author: nicolas-grekas

Tests/SmsapiTransportFactoryTest.php

@@ -21,7 +21,7 @@ public function createFactory(): SmsapiTransportFactory
         return new SmsapiTransportFactory();
     }
 
-    public function createProvider(): iterable
+    public static function createProvider(): iterable
     {
         yield [
             'smsapi://host.test?from=testFrom',
@@ -69,25 +69,25 @@ public function createProvider(): iterable
         ];
     }
 
-    public function supportsProvider(): iterable
+    public static function supportsProvider(): iterable
     {
         yield [true, 'smsapi://host?from=testFrom'];
         yield [true, 'smsapi://host?from=testFrom&fast=1'];
         yield [true, 'smsapi://host?from=testFrom&test=1'];
         yield [false, 'somethingElse://host?from=testFrom'];
     }
 
-    public function incompleteDsnProvider(): iterable
+    public static function incompleteDsnProvider(): iterable
     {
         yield 'missing token' => ['smsapi://host.test?from=testFrom'];
     }
 
-    public function missingRequiredOptionProvider(): iterable
+    public static function missingRequiredOptionProvider(): iterable
     {
         yield 'missing option: from' => ['smsapi://token@host'];
     }
 
-    public function unsupportedSchemeProvider(): iterable
+    public static function unsupportedSchemeProvider(): iterable
     {
         yield ['somethingElse://token@host?from=testFrom'];
         yield ['somethingElse://token@host']; // missing "from" option

Tests/SmsapiTransportTest.php

@@ -52,7 +52,7 @@ public function createClient(int $statusCode, string $content): HttpClientInterf
         return new MockHttpClient(new MockResponse($content, ['http_code' => $statusCode]));
     }
 
-    public function responseProvider(): iterable
+    public static function responseProvider(): iterable
     {
         $responses = [
             ['status' => 200, 'content' => '{"error":101,"message":"Authorization failed"}', 'errorMessage' => 'Unable to send the SMS: "Authorization failed".'],