Bump peter-evans/repository-dispatch from 2 to 3 (openhab#1834)

Bumps [peter-evans/repository-dispatch](https://github.com/peter-evans/repository-dispatch) from 2 to 3.
- [Release notes](https://github.com/peter-evans/repository-dispatch/releases)
- [Commits](peter-evans/repository-dispatch@v2...v3)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/docs-update-action.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Repository Dispatch
-        uses: peter-evans/repository-dispatch@v2
+        uses: peter-evans/repository-dispatch@v3
         with:
           token: ${{ secrets.DOCS_REPO_ACCESS_TOKEN }}
           repository: openhab/openhab-docs