hack: remove deprecated GO111MODULE=on

[Ankitsinghsisodya]

Fixes #16498

Changes

Remove the export GO111MODULE=on line from hack/update-checksums.sh and hack/update-reference-docs.sh.

GO111MODULE has been a no-op since Go 1.16 and is deprecated in Go 1.25. All other hack/ scripts already omit it.

[knative-prow]

Welcome @Ankitsinghsisodya! It looks like this is your first PR to knative/serving 🎉

[knative-prow]

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[Copilot]

Pull request overview

Removes the deprecated GO111MODULE=on environment export from the remaining hack/ scripts that still set it, aligning them with the rest of the repo and avoiding deprecated/no-op configuration on modern Go.

Changes:

• Remove export GO111MODULE=on from hack/update-checksums.sh.
• Remove export GO111MODULE=on from hack/update-reference-docs.sh.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
hack/update-reference-docs.sh	Drops deprecated GO111MODULE export before running reference-doc generation.
hack/update-checksums.sh	Drops deprecated GO111MODULE export before running checksum generation.

---

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[dprotaso]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Ankitsinghsisodya, dprotaso

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[dprotaso]

/ok-to-test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.18%. Comparing base (35cd19d) to head (ae4828a).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16499      +/-   ##
==========================================
- Coverage   80.26%   80.18%   -0.08%     
==========================================
  Files         217      217              
  Lines       13547    13547              
==========================================
- Hits        10873    10863      -10     
- Misses       2309     2318       +9     
- Partials      365      366       +1     

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