chore(deps): bump Go from 1.26.4 to 1.26.5

[infernus01]

Changes

Bump the Go toolchain version from 1.26.4 to 1.26.5 to
remediate stdlib CVEs
CVEs fixed by this change:

• CVE-2026-39822 (Important) — stdlib, fixed in Go 1.26.5
• CVE-2026-42505 (Moderate) — stdlib, fixed in Go 1.26.5

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Has Docs included if any changes are user facing
• Has Tests included if any functionality added or changed
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  functionality, content, code)
• Release notes block below has been updated with any user facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

NONE

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.60%. Comparing base (e44b60f) to head (2437875).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1904      +/-   ##
==========================================
+ Coverage   72.55%   72.60%   +0.05%     
==========================================
  Files          58       58              
  Lines        3855     3855              
==========================================
+ Hits         2797     2799       +2     
+ Misses        764      763       -1     
+ Partials      294      293       -1     

Flag	Coverage Δ
unit-tests	72.60% <ø> (+0.05%)	⬆️

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[enarha]

/lgtm

[tekton-robot]

@infernus01: PR needs rebase.

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