Update GitHub Actions workflows. (#234)

This PR was automatically generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit 43bac325ae81e59c79967ba4bae84a5eb47d9d57.

.github/workflows/upgrade-provider.yml

@@ -5,7 +5,7 @@ env:
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 jobs:
   upgrade_provider:
-    if: ${{ contains(github.event.issue.title, 'Upgrade terraform-provider-') || github.event_name == 'workflow_dispatch' }}
+    if: ${{ (github.event.issue.user.login == 'pulumi-bot' && contains(github.event.issue.title, 'Upgrade terraform-provider-')) || github.event_name == 'workflow_dispatch' }}
     name: upgrade-provider
     runs-on: ubuntu-latest
     steps: