feat!: upgrade to node24

[kwngo]

Node v20 is going to be EOL in April 2026 -- https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/, and is being deprecated by Github on March 4 2026.

Addresses #1162

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[ViacheslavKudinov]

HI,
its probably not only what needs to be done.
BTW it should be major version due to the specific GitHub version runner to be a dependency.
Eg v5.0.0 there https://github.com/googleapis/release-please-action/blob/main/package.json#L4,
could be node version https://github.com/googleapis/release-please-action/blob/main/package.json#L36 and https://github.com/googleapis/release-please-action/blob/main/package.json#L53,
changelog https://github.com/googleapis/release-please-action/blob/main/CHANGELOG.md and probably more.
Im not JS/TS person to be sure, but probably more places need to be updated.

PS Please, ignore, commented without knowing the release process.

[michaelfaith]

Eg v5.0.0 there https://github.com/googleapis/release-please-action/blob/main/package.json#L4c
changelog https://github.com/googleapis/release-please-action/blob/main/CHANGELOG.md

If you were familiar with the release please action, you'd know that it does this for you after PRs merge, in a release PR, and since this PR is using the correct PR title format, that will already be covered. 😊

[ViacheslavKudinov]

Eg v5.0.0 there https://github.com/googleapis/release-please-action/blob/main/package.json#L4c
changelog https://github.com/googleapis/release-please-action/blob/main/CHANGELOG.md

If you were familiar with the release please action, you'd know that it does this for you after PRs merge, in a release PR, and since this PR is using the correct PR title format, that will already be covered. 😊

Great to know.
Thank you for sharing.
Then we are good