Tests: make dataproviders static

As of PHPUnit 10, data providers are (again) expected to be `static` methods.

This updates the test suite to respect that.

tests/Unit/Admin/Options_Form_Generator_Test.php

@@ -469,7 +469,7 @@ public function test_is_checked( $option, $option_values, $parent_option, $asser
 	 *
 	 * @return array The data to run the test against.
 	 */
-	public function is_checked_provider() {
+	public static function is_checked_provider() {
 		return [
 			[
 				'test_option',

tests/Unit/Permissions_Helper_Test.php

@@ -266,7 +266,7 @@ public function test_is_edit_post_screen( $original, $expected ) {
 	 *
 	 * @return array The test parameters.
 	 */
-	public function is_edit_post_screen_provider() {
+	public static function is_edit_post_screen_provider() {
 		return [
 			[
 				'original' => [
@@ -339,7 +339,7 @@ public function test_is_new_post_screen( $original, $expected ) {
 	 *
 	 * @return array The test parameters.
 	 */
-	public function is_new_post_screen_provider() {
+	public static function is_new_post_screen_provider() {
 		return [
 			[
 				'original' => [
@@ -416,7 +416,7 @@ public function test_is_classic_editor( $original, $expected ) {
 	 *
 	 * @return array The test parameters.
 	 */
-	public function is_classic_editor_provider() {
+	public static function is_classic_editor_provider() {
 		return [
 			[
 				'original' => [
@@ -677,7 +677,7 @@ public function test_should_rewrite_and_republish_be_allowed( $original, $expect
 	 *
 	 * @return array The test parameters.
 	 */
-	public function should_rewrite_and_republish_be_allowed_provider() {
+	public static function should_rewrite_and_republish_be_allowed_provider() {
 		return [
 			[
 				'original' => [
@@ -749,7 +749,7 @@ public function test_post_type_has_admin_bar( $original, $expected ) {
 	 *
 	 * @return array The test parameters.
 	 */
-	public function post_type_has_admin_bar_provider() {
+	public static function post_type_has_admin_bar_provider() {
 		return [
 			[
 				'original' => [
@@ -819,7 +819,7 @@ public function test_is_copy_allowed_to_be_republished( $post_status, $expected
 	 *
 	 * @return array The test parameters.
 	 */
-	public function is_copy_allowed_to_be_republished_provider() {
+	public static function is_copy_allowed_to_be_republished_provider() {
 		return [
 			[
 				'post_status' => 'dp-rewrite-republish',

tests/Unit/Post_Duplicator_Test.php

@@ -85,7 +85,7 @@ public function test_generate_copy_title( $original, $expected ) {
 	 *
 	 * @return array
 	 */
-	public function generate_copy_title_provider() {
+	public static function generate_copy_title_provider() {
 		$data = [];
 
 		$data[] = [
@@ -186,7 +186,7 @@ static function ( $post_type ) {
 	 *
 	 * @return array
 	 */
-	public function generate_copy_status_provider() {
+	public static function generate_copy_status_provider() {
 		$data = [];
 
 		$data[] = [
@@ -290,7 +290,7 @@ static function ( $post_type ) {
 	 *
 	 * @return array
 	 */
-	public function generate_copy_author_provider() {
+	public static function generate_copy_author_provider() {
 		$data = [];
 
 		$data[] = [

tests/Unit/Post_Republisher_Test.php

@@ -203,7 +203,7 @@ public function test_change_post_copy_status( $input, $expected ) {
 	 *
 	 * @return array
 	 */
-	public function change_post_copy_status_provider() {
+	public static function change_post_copy_status_provider() {
 		return [
 			[
 				[

tests/Unit/UI/Block_Editor_Test.php

@@ -187,7 +187,7 @@ public function test_should_previously_used_keyword_assessment_run( $original, $
 	 *
 	 * @return array The test parameters.
 	 */
-	public function should_previously_used_keyword_assessment_run_provider() {
+	public static function should_previously_used_keyword_assessment_run_provider() {
 		return [
 			[
 				'original' => [

tests/Unit/Utils_Test.php

@@ -27,7 +27,7 @@ public function test_flatten_version( $original, $expected ) {
 	 *
 	 * @return array
 	 */
-	public function flatten_version_provider() {
+	public static function flatten_version_provider() {
 		return [
 			[ '3.0', '300' ],
 			[ '1.4', '140' ],
@@ -56,7 +56,7 @@ public function test_addslashes_to_strings_only( $original, $expected ) {
 	 *
 	 * @return array
 	 */
-	public function addslashes_to_strings_only_provider() {
+	public static function addslashes_to_strings_only_provider() {
 		return [
 			[ "O'Reilly", "O\'Reilly" ],
 			[ 'A string with "quotes"', 'A string with \"quotes\"' ],