Bump peter-evans/slash-command-dispatch from 3 to 4

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

---
updated-dependencies:
- dependency-name: peter-evans/slash-command-dispatch
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/ok-to-test.yml

@@ -27,7 +27,7 @@ jobs:
         private_key: ${{ secrets.PRIVATE_KEY }}
 
     - name: Slash Command Dispatch
-      uses: peter-evans/slash-command-dispatch@v3
+      uses: peter-evans/slash-command-dispatch@v4
       env:
         TOKEN: ${{ steps.generate_token.outputs.token }}
       with: