Make phpunit dataprovider a static function

Author: arnested

tests/DrupalOrg/VersionGroupTest.php

@@ -63,7 +63,7 @@ public function versionGroups(): array
      * @param string|null $nextVersion
      *   The expected next version (if any)
      */
-    public function testGetNextVersion(
+    public static function testGetNextVersion(
         array $versions,
         string $currentVersion,
         ?string $nextVersion