Update GitHub Actions workflows. (#1643)

This PR was triggered by @t0yv0 generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit
[c6e5ebd815640acfda69f1b17aa5b69710b64e39](pulumi/ci-mgmt@c6e5ebd).

## Rebasing this PR

If this PR falls behind `master` on pulumi-cloudflare and needs to be
regenerated against the latest tip, dispatch
[`update-workflows-single-bridged-provider`](https://github.com/pulumi/ci-mgmt/actions/workflows/update-workflows-single-bridged-provider.yml):

```sh
gh workflow run update-workflows-single-bridged-provider.yml \
  --repo pulumi/ci-mgmt \
  -f provider_name=cloudflare \
  -f automerge=false
```

That re-runs this same workflow against current ci-mgmt `master`, closes
this stale PR (via the "obsolete PR" cleanup step above), and opens a
fresh one rebased on the provider's current `master`.

Co-authored-by: Pulumi Bot <bot@pulumi.com>

Author: pulumi-provider-automation[bot]