drop use of deprecated knative.dev/networking/pkg

[dprotaso]

Part of knative/networking#1102

[knative-prow]

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[dprotaso]

/assign @linkvt @nader-ziada

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 80.06%. Comparing base (f947d73) to head (729827b).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/reconciler/nscert/config/store.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16272      +/-   ##
==========================================
- Coverage   80.07%   80.06%   -0.02%     
==========================================
  Files         215      215              
  Lines       13327    13327              
==========================================
- Hits        10672    10670       -2     
+ Misses       2297     2295       -2     
- Partials      358      362       +4     

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[linkvt]

/lgtm