chore(deps): update go toolchain directive to v1.26.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
go (source)	toolchain	patch	1.26.1 → 1.26.3

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Release Notes

golang/go (go)

v1.26.3

v1.26.2

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.46%. Comparing base (f9911de) to head (660bfc7).
⚠️ Report is 2 commits behind head on main.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
- Coverage   48.49%   48.46%   -0.04%     
==========================================
  Files          25       25              
  Lines        5650     5650              
==========================================
- Hits         2740     2738       -2     
- Misses       2166     2168       +2     
  Partials      744      744              

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