Update GitHub Actions workflows. (#779)

This PR was automatically generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit f76cbff100ad8e6e3192b379edb5bcf1f536eb3e.

Author: pulumi-bot

.github/workflows/publish.yml

@@ -234,7 +234,7 @@ jobs:
         name: Fetch secrets from ESC
         uses: pulumi/esc-action@9eb774255b1a4afb7855678ae8d4a77359da0d9b
       - name: Dispatch Metadata build
-        uses: peter-evans/repository-dispatch@5fc4efd1a4797ddb68ffd0714a238564e4cc0e6f # v4
+        uses: peter-evans/repository-dispatch@28959ce8df70de7be546dd1250a005dd32156697 # v4
         with:
           token: ${{ steps.esc-secrets.outputs.PULUMI_BOT_TOKEN }}
           repository: pulumi/registry