[Automated] Update net-certmanager nightly

[knative-automation]

/assign @knative/serving-writers
/cc @knative/serving-writers

Produced via:

for x in net-certmanager.yaml; do
  curl https://storage.googleapis.com/knative-nightly/net-certmanager/latest/$x > ${GITHUB_WORKSPACE}/./third_party/cert-manager-latest/$x
done

Details:

bumping knative.dev/net-certmanager 67dcf8f...11a03e6:
  > 11a03e6 Add consistent SECURITY.md (# 629)

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (aec0c3b) 86.04% compared to head (5f39569) 86.02%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14643      +/-   ##
==========================================
- Coverage   86.04%   86.02%   -0.03%     
==========================================
  Files         197      197              
  Lines       14929    14929              
==========================================
- Hits        12846    12843       -3     
- Misses       1774     1776       +2     
- Partials      309      310       +1     

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[knative-prow]

@knative-automation: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
https_serving_main	5f39569	link	false	/test https

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