Update GitHub Actions workflows. (#48)

This PR was automatically generated by the
rollout-single-native-provider-workflow workflow in the pulumi/ci-mgmt
repo, from commit 1ccdca8fcd563ed4a1c7b82fdcebcf87cf598569.

.github/workflows/weekly-pulumi-update.yml

@@ -130,7 +130,7 @@ jobs:
       uses: repo-sync/pull-request@v2.6.2
       with:
         source_branch: update-pulumi/${{ github.run_id }}-${{ github.run_number }}
-        destination_branch: master
+        destination_branch: main
         pr_title: Automated Pulumi/Pulumi upgrade
         github_token: ${{ secrets.PULUMI_BOT_TOKEN }}
       env: