chore(deps): update node.js to v21 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
node	final	major	20-alpine -> 21-alpine

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Release Notes

nodejs/node (node)

### [`v21`](https://togithub.com/nodejs/node/blob/HEAD/CHANGELOG.md#2016-01-21-Version-426-Argon-LTS--TheAlphaNerd) Moved to doc/changelogs/CHANGELOG_V4.md#4.2.6.

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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This PR has been generated by Mend Renovate. View repository job log here.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (ffd3bdf) 93.93% compared to head (c62bf61) 93.93%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #281 +/- ## ======================================= Coverage 93.93% 93.93% ======================================= Files 4 4 Lines 33 33 Branches 14 14 ======================================= Hits 31 31 Misses 2 2 ```

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