docs(.github/pull_request_template): update test command to use explicit 'pnpm run' syntax (#9733)

Author: sukvvon

.github/pull_request_template.md

@@ -5,7 +5,7 @@
 ## ✅ Checklist
 
 - [ ] I have followed the steps in the [Contributing guide](https://github.com/TanStack/query/blob/main/CONTRIBUTING.md).
-- [ ] I have tested this code locally with `pnpm test:pr`.
+- [ ] I have tested this code locally with `pnpm run test:pr`.
 
 ## 🚀 Release Impact