Update golang Docker tag to v1.26.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
golang	stage	patch	1.26.2 → 1.26.4

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Dependency Review

✅ No vulnerabilities or license issues found.

Scanned Files

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.80%. Comparing base (1b965ac) to head (78bde01).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2610   +/-   ##
=======================================
  Coverage   81.80%   81.80%           
=======================================
  Files        1793     1793           
  Lines      173037   173037           
=======================================
+ Hits       141545   141557   +12     
+ Misses      23686    23676   -10     
+ Partials     7806     7804    -2     

Flag	Coverage Δ
unittests	81.80% <ø> (+<0.01%)	⬆️

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see 8 files with indirect coverage changes

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