fix(lint-staged): use negative pattern correctly (#8842)

Negative patterns must start with the `!`, not just contain it. This is
why YAML files were not formatted since 6184aff.

Author: caugner

Diff for: lint-staged.config.js

@@ -1,5 +1,5 @@
 export default {
-  "*.!{js,jsx,ts,tsx,css,scss}": "prettier --ignore-unknown --write",
+  "!*.{js,jsx,ts,tsx,css,scss}": "prettier --ignore-unknown --write",
   "*.{js,jsx,ts,tsx}": ["eslint --fix", "prettier --write"],
   "*.{css,scss}": ["stylelint --fix --allow-empty-input", "prettier --write"],
 };