ci: add nodejs v26 to ci

[evenstensberg]

Summary

Adds v26 to ci

What kind of change does this PR introduce?

ci

Did you add tests for your changes?

Generic, no need.

Does this PR introduce a breaking change?

No

If relevant, what needs to be documented once your changes are merged or what have you already documented?

N/A

Use of AI

No

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.40%. Comparing base (c36236e) to head (881c783).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #216   +/-   ##
=======================================
  Coverage   95.40%   95.40%           
=======================================
  Files           9        9           
  Lines         848      848           
  Branches      361      360    -1     
=======================================
  Hits          809      809           
  Misses         35       35           
  Partials        4        4           

Flag	Coverage Δ
integration	95.40% <ø> (ø)

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