Remove a note about cloudpickle support being experimental · apache/beam@d59cc77

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/setup-java@v3, gradle/gradle-build-action@v2. 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) 'distribution', valid inputs are ['python-version', 'java-version', 'go-version', 'disable-cache', 'python-cache', 'tox-cache']

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