chore(deps): update go toolchain directive to v1.26.4

[renovate]

⚠️ Only upgrade the go version once you verified locally that the new go version works with the current swagger version. To do so, upgrade your machine to the new go version and run make setup && pre-commit run --all-files.

This PR contains the following updates:

Package	Type	Update	Change
go (source)	toolchain	patch	1.26.3 → 1.26.4

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Release Notes

golang/go (go)

v1.26.4

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.54%. Comparing base (2811c0e) to head (4c0187f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1282   +/-   ##
=======================================
  Coverage   79.54%   79.54%           
=======================================
  Files          57       57           
  Lines        3827     3827           
=======================================
  Hits         3044     3044           
  Misses        638      638           
  Partials      145      145           

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