automation(pr-bot): Add note about summer holidays (kedacore#1180)

.github/workflows/pr-bot-welcome.yml

@@ -24,5 +24,5 @@ jobs:
               owner: context.repo.owner,
               repo: context.repo.repo,
               issue_number: ${{ github.event.number }},
-              body: 'Thank you for your contribution! 🙏 We will review your PR as soon as possible.\n\n\nWhile you are waiting, make sure to:\n\n\n- Add your contribution to all applicable KEDA versions\n- GitHub checks are passing\n- Is the DCO check failing? Here is [how you can fix DCO issues](https://github.com/kedacore/keda/blob/main/CONTRIBUTING.md#i-didnt-sign-my-commit-now-what)\n\n\nLearn more about:\n- How to become a [listed end-user](https://github.com/kedacore/keda-docs#become-a-listed-keda-user) or a [listed commerical offering](https://github.com/kedacore/keda-docs#become-a-listed-keda-commercial-offering)\n- Our [contribution guide](https://github.com/kedacore/keda-docs/blob/main/CONTRIBUTING.md)'
+              body: 'Thank you for your contribution! 🙏 We will review your PR as soon as possible.\n\n\n> 🏖️ Over the summer, [the response time will be longer than usual due to maintainers taking time off](https://github.com/kedacore/keda/issues/4773) so please bear with us.\n\n\nWhile you are waiting, make sure to:\n\n\n- Add your contribution to all applicable KEDA versions\n- GitHub checks are passing\n- Is the DCO check failing? Here is [how you can fix DCO issues](https://github.com/kedacore/keda/blob/main/CONTRIBUTING.md#i-didnt-sign-my-commit-now-what)\n\n\nLearn more about:\n- How to become a [listed end-user](https://github.com/kedacore/keda-docs#become-a-listed-keda-user) or a [listed commerical offering](https://github.com/kedacore/keda-docs#become-a-listed-keda-commercial-offering)\n- Our [contribution guide](https://github.com/kedacore/keda-docs/blob/main/CONTRIBUTING.md)'
             });