chore(deps): bump go to 1.26.3 in all go.mod files

[reggie-k]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.99%. Comparing base (5ec0603) to head (aa64e6e).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #27772      +/-   ##
==========================================
+ Coverage   63.96%   63.99%   +0.03%     
==========================================
  Files         421      421              
  Lines       57774    57774              
==========================================
+ Hits        36954    36973      +19     
+ Misses      17339    17321      -18     
+ Partials     3481     3480       -1     

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