Update GitHub Actions workflows. (#518)

This PR was automatically generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit 2cd5c3875cef8eec07907563f95fa52f78b564d0.

.upgrade-config.yml

@@ -4,4 +4,3 @@
 upstream-provider-name: terraform-provider-postgresql
 pulumi-infer-version: true
 remove-plugins: true
-pr-reviewers: iwahbe # Team: pulumi/Providers