MDL-81521 core: Update all possibly data providers to be static

Note: Some data providers could not be automatically be converted to
being static. These will be handled in a separate issue.

lib/tests/plugininfo/base_test.php

@@ -83,7 +83,7 @@ class base_test extends \advanced_testcase {
      *
      * @return array
      */
-    public function load_disk_version_invalid_supported_version_provider(): array {
+    public static function load_disk_version_invalid_supported_version_provider(): array {
         return [
             'Invalid supported range.' => [
                 'supported' => [31, 29],
@@ -149,7 +149,7 @@ class base_test extends \advanced_testcase {
      *
      * @return array
      */
-    public function load_disk_version_invalid_incompatible_version_provider(): array {
+    public static function load_disk_version_invalid_incompatible_version_provider(): array {
         return [
             [[38]],
             [['38']],
@@ -197,7 +197,7 @@ class base_test extends \advanced_testcase {
      *
      * @return array
      */
-    public function load_disk_version_branch_supports_provider(): array {
+    public static function load_disk_version_branch_supports_provider(): array {
         return [
             'Range, branch in support, lowest' => [
                 'supported' => [29, 31],