[Automated] Update net-kourier nightly

[knative-automation]

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

Produced via:

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

Details:

bumping knative.dev/net-kourier 644b5c8...a895a08:
  > a895a08 Use aligned flags and secrets for `system-internal-tls` (# 1116)
  > 3fdb548 upgrade to latest dependencies (# 1127)

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (4c3aaee) 86.08% compared to head (3280bda) 86.08%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14469   +/-   ##
=======================================
  Coverage   86.08%   86.08%           
=======================================
  Files         196      196           
  Lines       14880    14880           
=======================================
  Hits        12810    12810           
  Misses       1759     1759           
  Partials      311      311           

see 4 files with indirect coverage changes

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[skonto]

/lgtm

[skonto]

/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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[ReToCode]

Seems like this does not work standalone and needs a combination of this PR, #14379 and #14399 and #14467

Trying to do this in: #14472