chore: go mod tidy after v0.17.4 security upgrades

[thomasmaas]

Follow-up go mod tidy after the security dependency upgrade backport.

The backport PR was merged before go mod tidy was applied to clean up go.sum. This PR removes spurious entries left by the conflict resolution.

No functional changes — go.sum cleanup only.

🤖 Generated with Claude Code

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.07%. Comparing base (2bd68aa) to head (0893b30).
⚠️ Report is 1 commits behind head on release-0.17.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-0.17     #282      +/-   ##
================================================
- Coverage         76.16%   76.07%   -0.09%     
================================================
  Files                18       18              
  Lines              1137     1137              
================================================
- Hits                866      865       -1     
- Misses              216      217       +1     
  Partials             55       55              

Flag	Coverage Δ
integration	71.76% <ø> (+0.26%)	⬆️
unit	46.96% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
api/v1alpha1 (u)	91.48% <ø> (ø)
pkg/helpers (u)	80.95% <ø> (ø)
pkg/log (u)	94.73% <ø> (ø)
pkg/reconcilers (u)	63.12% <ø> (ø)
pkg/limitador (u)	98.28% <ø> (ø)
controllers (i)	70.89% <ø> (-0.29%)	⬇️
pkg/upgrades	∅ <ø> (∅)
see 1 file with indirect coverage changes

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