Update GitHub Actions workflows. (#1066)

This PR was automatically generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit a9530f0b7c143fd506052a4cc7a55fa6f6d6469d.

Author: pulumi-bot

.github/workflows/upgrade-provider.yml

@@ -76,7 +76,7 @@ jobs:
           kind: all
           email: [email protected]
           username: pulumi-bot
-          automerge: false
+          automerge: true
           target-version: ${{ steps.target_version.outputs.version }}
           allow-missing-docs: false
       - name: Comment on upgrade issue if automated PR failed