upgrade nodejs version

[sensuikan1973]

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[gemini-code-assist]

Code Review

This pull request updates the Node.js version in the .node-version file from 25.8.2 to 25.9.0. I have no feedback to provide.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.13%. Comparing base (0e28c8b) to head (62f7b5b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2905   +/-   ##
=======================================
  Coverage   94.13%   94.13%           
=======================================
  Files          52       52           
  Lines        1483     1483           
=======================================
  Hits         1396     1396           
  Misses         87       87           

Flag	Coverage Δ
integration_test	65.00% <ø> (ø)
macos-latest	93.05% <ø> (ø)
ubuntu	93.59% <ø> (ø)
widget_test	90.22% <ø> (ø)
windows	93.45% <ø> (ø)

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