Bump cert-manager to 1.7.1

[nak3]

Release Note

net-certmanager starts testing cert-manager v1.7.1.

[ZhiminXiang]

/lgtm

[codecov]

Codecov Report

Merging #12605 (64f73b7) into main (52f07b0) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #12605      +/-   ##
==========================================
+ Coverage   87.48%   87.52%   +0.04%     
==========================================
  Files         195      195              
  Lines        9718     9718              
==========================================
+ Hits         8502     8506       +4     
+ Misses        931      928       -3     
+ Partials      285      284       -1     

Impacted Files	Coverage Δ
pkg/reconciler/revision/background.go	91.81% <0.00%> (+1.81%)	⬆️
pkg/autoscaler/statserver/server.go	79.61% <0.00%> (+1.94%)	⬆️

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[nak3]

/test pull-knative-serving-upgrade-tests

unrelated failure.

[nak3]

/test pull-knative-serving-upgrade-tests

Hmm 🤔 Upgrade-test does not use net-certmanager so the failure should not be related.

[dprotaso]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, nak3, ZhiminXiang

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