chore(deps): update node docker tag to v20

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
node	stage	major	18 -> 20

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Release Notes

nodejs/node (node)

v20

Moved to doc/changelogs/CHANGELOG_V012.md#0.12.14.

v19

Moved to doc/changelogs/CHANGELOG_IOJS.md#1.6.0.

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Configuration

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[webteam-app]

Demo starting at https://dqlite-io-288.demos.haus

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (39950b2) 75.60% compared to head (3ec4531) 75.60%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #288   +/-   ##
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  Coverage   75.60%   75.60%           
=======================================
  Files           3        3           
  Lines          41       41           
=======================================
  Hits           31       31           
  Misses         10       10           

Flag	Coverage Δ
python	75.60% <ø> (ø)

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