chore(cloudflare:test): improve runInDurableObject type (#5975)

* chore(cloudflare:test): improve `runInDurableObject` type
- this insures the callback's `instance` parameter infers the stub's type, which will include any typed RPC methods if they exist

* Update packages/vitest-pool-workers/types/cloudflare-test.d.ts

Co-authored-by: Rahul Sethi <[email protected]>

---------

Co-authored-by: Rahul Sethi <[email protected]>

Author: thiskevinwang

packages/vitest-pool-workers/types/cloudflare-test.d.ts

@@ -45,7 +45,7 @@ declare module "cloudflare:test" {
 	 * Objects defined in the `main` worker.
 	 */
 	export function runInDurableObject<O extends DurableObject, R>(
-		stub: DurableObjectStub,
+		stub: DurableObjectStub<O>,
 		callback: (instance: O, state: DurableObjectState) => R | Promise<R>
 	): Promise<R>;
 	/**