Bump node/npm version to match Vercel

[fregante]

Vercel (AWS Lambda) recently bumped their Node 20 version:

Not really an issue, but:

• this version natively includes npm 10.5.0, which means you don't have to install npm separately to match the version
• this version lets me use import attributes for https://github.com/pixiebrix/pixiebrix-extension/pull/8151
• bumping is good (we do use dependabot weekly)

[codecov[bot]]

Codecov Report

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

Project coverage is 73.37%. Comparing base (b2b87d2) to head (70682b0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8175      +/-   ##
==========================================
- Coverage   73.39%   73.37%   -0.02%     
==========================================
  Files        1313     1313              
  Lines       40717    40717              
  Branches     7571     7571              
==========================================
- Hits        29884    29876       -8     
- Misses      10833    10841       +8     

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[grahamlangford]

Can you ping #engineering letting everyone know about the version bump when you merge?