refactor(github): add type annotation to fetchWithRetry return type (JhaSourav07#593)

Co-authored-by: ShreyasPatil3105 <ShreyasPatil3105-shreyasp310505@gmail.com>

Author: JhaSourav07

lib/github.ts

@@ -21,15 +21,15 @@ const REST_TIMEOUT_MS = 5000; // 5s for REST endpoints
 
 // Retry delay uses exponential backoff: delay = BASE_DELAY_MS * 2^attempt.
 export async function fetchWithRetry(
-  url: string,
+  url: string | URL,
   options: RequestInit,
   attempt = 0,
   timeoutMs?: number
 ): Promise<Response> {
   // Determine default timeout based on endpoint type if not explicitly provided.
   // GraphQL calls carry a larger payload and need a slightly longer window.
   const resolvedTimeout =
-    timeoutMs ?? (url.includes('graphql') ? GRAPHQL_TIMEOUT_MS : REST_TIMEOUT_MS);
+    timeoutMs ?? (url.toString().includes('graphql') ? GRAPHQL_TIMEOUT_MS : REST_TIMEOUT_MS);
 
   if (options.signal?.aborted) {
     throw new Error('AbortError');