Update go toolchain directive to v1.26.6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
go (source)	toolchain	patch	1.26.5 → 1.26.6

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Release Notes

golang/go (go)

v1.26.6

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 36.32%. Comparing base (32fc8ed) to head (ad50f9f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #426   +/-   ##
=======================================
  Coverage   36.32%   36.32%           
=======================================
  Files          25       25           
  Lines         647      647           
=======================================
  Hits          235      235           
  Misses        370      370           
  Partials       42       42           

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