chore(config_loader): update docker.io/golang docker tag to v1.26.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/golang	stage	minor	1.25.7-alpine → 1.26.0-alpine

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.77%. Comparing base (170a6f7) to head (bbf7c78).
⚠️ Report is 26 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (170a6f7) and HEAD (bbf7c78). Click for more details.

HEAD has 192 uploads less than BASE

Flag	BASE (170a6f7)	HEAD (bbf7c78)
	193	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main   #39009       +/-   ##
===========================================
- Coverage   33.65%    0.77%   -32.88%     
===========================================
  Files         324       65      -259     
  Lines        3640     2056     -1584     
  Branches       41        0       -41     
===========================================
- Hits         1225       16     -1209     
+ Misses       2415     2040      -375     

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