Add ava.config.mjs to default watcher ignore patterns

Author: novemberborn

lib/globs.js

@@ -26,6 +26,7 @@ const defaultIgnoredByWatcherPatterns = [
 	'**/*.snap.md', // No need to rerun tests when the Markdown files change.
 	'ava.config.js', // Config is not reloaded so avoid rerunning tests when it changes.
 	'ava.config.cjs', // Config is not reloaded so avoid rerunning tests when it changes.
+	'ava.config.mjs', // Config is not reloaded so avoid rerunning tests when it changes.
 ];
 
 const buildExtensionPattern = extensions => extensions.length === 1 ? extensions[0] : `{${extensions.join(',')}}`;