docs: fix node version in CONTRIBUTING.md

[exoego]

:bookmark_tabs: Summary

Resolves #5572

:straight_ruler: Design Decisions

N/A

:clipboard: Tasks

Make sure you

• [x] :book: have read the contribution guidelines
• [ ] :computer: have added necessary unit/e2e tests.
• [ ] :notebook: have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
• [ ] :bookmark: targeted develop branch

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[codecov[bot]]

Codecov Report

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

Project coverage is 5.73%. Comparing base (63f9e95) to head (9c3bcec).

Additional details and impacted files

[](https://app.codecov.io/gh/mermaid-js/mermaid/pull/5573?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mermaid-js) ```diff @@ Coverage Diff @@ ## develop #5573 +/- ## ======================================= Coverage 5.73% 5.73% ======================================= Files 277 277 Lines 41988 41988 Branches 515 515 ======================================= Hits 2409 2409 Misses 39579 39579 ``` | [Flag](https://app.codecov.io/gh/mermaid-js/mermaid/pull/5573/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mermaid-js) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/mermaid-js/mermaid/pull/5573/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mermaid-js) | `5.73% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mermaid-js#carryforward-flags-in-the-pull-request-comment) to find out more.

[nirname]

Thank you for the contribution. I know it is a bit confusing, but no need for updating docs folder manually (only those which are inside the package).

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