Improve key names validation for keys from user nuget config

src/authutil.ts

@@ -25,9 +25,7 @@ export function configAuthentication(
   writeFeedToFile(feedUrl, existingNuGetConfig, tempNuGetConfig);
 }
 
-function isValidKey(
+function isValidKey(key: string): boolean {
-  key: string
-): boolean {
   return /^[0-9\w\-\_\.]+$/i.test(key);
 }