Add some missing testdata/ prefixes. · google/error-prone@50d0983

The following actions use a deprecated Node.js version and will be forced to run on node20: styfle/[email protected], actions/checkout@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Unexpected input(s) 'cache', valid inputs are ['website', 'release', 'version', 'install', 'install-as-version', 'uri']

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