change internal error to warning

src/cache-utils.ts

@@ -111,10 +111,12 @@ export function isCacheFeatureAvailable(): boolean {
         'Cache action is only supported on GHES version >= 3.5. If you are on version >=3.5 Please check with GHES admin if Actions cache service is enabled or not.'
       );
     } else {
-      throw new Error(
+      core.warning(
         'An internal error has occurred in cache backend. Please check https://www.githubstatus.com/ for any ongoing issue in actions.'
       );
     }
+
+    return false;
   }
 
   return true;