fix: clearTimeout instead of clearInterval (#1305)

jest modern timers break because the stale timeout is created with setTimeout but cleared with clearInterval

Author: AngusMorton

src/core/queryObserver.ts

@@ -233,7 +233,7 @@ export class QueryObserver<TResult, TError> {
 
   private clearStaleTimeout(): void {
     if (this.staleTimeoutId) {
-      clearInterval(this.staleTimeoutId)
+      clearTimeout(this.staleTimeoutId)
       this.staleTimeoutId = undefined
     }
   }