Update GitHub Actions workflows. (#2393)

This PR was automatically generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit 5afb0cce7491844387acc1745a6960b094734753.

Makefile

@@ -181,7 +181,7 @@ bin/pulumi-java-gen: .pulumi-java-gen.version
 # - Run make ci-mgmt to apply the change locally.
 #
 ci-mgmt: .ci-mgmt.yaml
- rm -f .github/workflows/*.yml # Copied from update-workflows.yml
+ find .github/workflows/*.yml -type f ! -name "$(PACK)*.yml" -delete
  go run github.com/pulumi/ci-mgmt/provider-ci@master generate \
  --name $(ORG)/pulumi-$(PACK) \
  --out . \