Replace Node.js 20 actions in release workflow (DamianReeves/write-file-action, EndBug/add-and-commit)

[jirispilka]

Context

GitHub is deprecating Node.js 20 for Actions runners (forced Node.js 24 starting June 2, 2026).

Two third-party actions in _update_release_metadata.yaml still run on Node.js 20:

• DamianReeves/write-file-action@master
• EndBug/add-and-commit@v9

Neither has released a Node 24-compatible version yet.

Action needed

Before June 2, 2026, either:

1. Update to newer versions of these actions if Node 24 support is released
2. Replace them with shell commands (the operations are trivial — write a file and git add/commit)

References

• GitHub deprecation notice
• PR chore: Update actions/checkout to v6 and bump minimum Node.js to 22 #553 updated actions/checkout to v6