Bump peter-evans/repository-dispatch from 3 to 4

Bumps [peter-evans/repository-dispatch](https://github.com/peter-evans/repository-dispatch) from 3 to 4.
- [Release notes](https://github.com/peter-evans/repository-dispatch/releases)
- [Commits](peter-evans/repository-dispatch@v3...v4)

---
updated-dependencies:
- dependency-name: peter-evans/repository-dispatch
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/reusable-trigger-jepsen-tests-workflow.yml

@@ -29,7 +29,7 @@ jobs:
           echo "rabbitmq_binary_url=$rabbitmq_binary_url"
           echo "rabbitmq_binary_url=$rabbitmq_binary_url" >> $GITHUB_ENV
       - name: Dispatch event to trigger Jepsen tests
-        uses: peter-evans/repository-dispatch@v3
+        uses: peter-evans/repository-dispatch@v4
         with:
           event-type: new_alpha_${{ env.rabbitmq_branch }}
           repository: rabbitmq/jepsen