use annotation helpers

[dprotaso]

• bump knative.dev/networking
• Use annotation helper functions

Part of #12103

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso

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[codecov]

Codecov Report

Merging #12307 (58e6c4a) into main (deb8a0b) will decrease coverage by 0.02%.
The diff coverage is 78.57%.

@@            Coverage Diff             @@
##             main   #12307      +/-   ##
==========================================
- Coverage   87.49%   87.47%   -0.03%     
==========================================
  Files         195      195              
  Lines        9591     9591              
==========================================
- Hits         8392     8390       -2     
- Misses        920      921       +1     
- Partials      279      280       +1     

Impacted Files	Coverage Δ
pkg/reconciler/nscert/nscert.go	69.87% <0.00%> (ø)
pkg/reconciler/route/route.go	78.40% <66.66%> (ø)
pkg/reconciler/route/resources/ingress.go	93.06% <87.50%> (ø)
pkg/reconciler/domainmapping/reconciler.go	92.10% <100.00%> (ø)
pkg/reconciler/configuration/configuration.go	84.61% <0.00%> (-1.54%)	⬇️

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[nader-ziada]

/lgtm

[nader-ziada]

/lgtm

[dprotaso]

/retest