chore: deprecated filter

Fix the deprecation warning of `graphql_data_loaders` filter.

Warning:
> The graphql_data_loaders filter is deprecated and will be removed in a future version. Instead, use the graphql_data_loader_classes filter to add/change data loader classes before they are instantiated.
https://github.com/wp-graphql/wp-graphql/blob/131659f1a6118dcf429480002d979c4016440c20/src/AppContext.php#L196-L209

Author: kuuak

src/WPGraphQLAcf.php

@@ -46,7 +46,7 @@ public function init(): void {
 
 		add_filter( 'graphql_resolve_revision_meta_from_parent', [ $this, 'preview_support' ], 10, 4 );
 
-		add_filter( 'graphql_data_loaders', [ $this, 'register_loaders' ], 10, 2 );
+		add_filter( 'graphql_data_loader_classes', [ $this, 'register_loaders' ], 10, 2 );
 		add_filter( 'graphql_resolve_node_type', [ $this, 'resolve_acf_options_page_node' ], 10, 2 );
 		/**
 		 * This filters any field that returns the `ContentTemplate` type