build: CI (windows-latest, 3.4, --include-spec) fails on setup

See [logs](https://github.com/googleapis/google-api-ruby-client/actions/runs/26357968418/job/77588087036?pr=26532#logs). Fails after:

```
Run ruby/setup-ruby@v1
  with:
    ruby-version: 3.4
    bundler-cache: false
    token: ***
Downloading msys2 build tools
  https://github.com/ruby/setup-msys2-gcc/releases/latest/download/msys2-ucrt64.7z
```

Does the GH action need an update?