Add minio to denylist for upstream checks (#774)

Due to pulumi/pulumi-minio#200 we are
currently uable to upgrade the Pulumi MinIO provider.

We should not continue to check for upstream updates that we cannot
take.

Part of pulumi/upgrade-provider#221.

provider-ci/internal/pkg/templates/bridged-provider/.github/workflows/check-upstream-upgrade.yml

@@ -1,4 +1,4 @@
-#{{- if not (eq .Config.provider "gcp" "aws" "azure" "mysql") }}#
+#{{- if not (eq .Config.provider "gcp" "aws" "azure" "mysql" "minio") }}#
 #WARNING: This file is autogenerated - changes will be overwritten if not made via https://github.com/pulumi/ci-mgmt
 
 env: