[BC Break] Make data providers for abstract test cases static

Author: OskarStark

Tests/SmsapiTransportFactoryTest.php

@@ -25,31 +25,31 @@ public function createFactory(): TransportFactoryInterface
         return new SmsapiTransportFactory();
     }
 
-    public function createProvider(): iterable
+    public static function createProvider(): iterable
     {
         yield [
             'smsapi://host.test?from=testFrom',
             'smsapi://[email protected]?from=testFrom',
         ];
     }
 
-    public function supportsProvider(): iterable
+    public static function supportsProvider(): iterable
     {
         yield [true, 'smsapi://host?from=testFrom'];
         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

@@ -53,7 +53,7 @@ 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".'],