lsp-graphql: fix unnecessary changes

Author: suzuki

clients/lsp-graphql.el

@@ -58,7 +58,7 @@ may be activated if appropriate GraphQL content is detected."
 (defun lsp-graphql-activate-p (filename &optional _)
   "Check if the GraphQL language server should be enabled based on FILENAME."
   (let ((target-extensions (mapconcat 'identity lsp-graphql-target-file-extensions "\\|")))
-    (or (string-match-p (format "\\.%s\\'" target-extensions) filename)
+    (or (string-match-p (format "\\.\\(?:%s\\)\\'" target-extensions) filename)
         (and (apply 'derived-mode-p lsp-graphql-activated-modes)
              (not (derived-mode-p 'json-mode))))))