[Automated] Update net-istio nightly

[knative-automation]

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

Produced via:

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

Details:

bumping knative.dev/net-istio caff26d...48b7c77:
  > 48b7c77 fix golangci-lint config (# 1413)
  > 2c2fd34 upgrade to latest dependencies (# 1411)
  > 529d6fa allow removing the finalizer if a gateway is missing (# 1410)

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.83%. Comparing base (09ec3f5) to head (77b3d96).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15789   +/-   ##
=======================================
  Coverage   80.83%   80.83%           
=======================================
  Files         222      222           
  Lines       18075    18075           
=======================================
  Hits        14611    14611           
  Misses       3094     3094           
  Partials      370      370           

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