Update GitHub Actions workflows. (#5722)

This PR was automatically generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit b3ee77fa5b79734c33e2a074744b4f5873e72478.

Author: pulumi-bot

mise.toml

@@ -14,3 +14,6 @@ java = 'corretto-11'
 pulumi = 'latest'
 "go:github.com/pulumi/pulumictl/cmd/pulumictl" = 'latest'
 gradle = '7.6'
+
+[settings]
+experimental = true # Required for Go binaries (e.g. pulumictl).