[Automated] Update net-certmanager nightly

[knative-automation]

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

Produced via:

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

Details:

bumping knative.dev/net-certmanager dcff364...ece6a96:
  > ece6a96 Update community files (# 707)

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[knative-prow]

@knative-automation: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
istio-latest-no-mesh-tls_serving_main	ecf448c	link	true	/test istio-latest-no-mesh-tls
istio-latest-no-mesh_serving_main	ecf448c	link	true	/test istio-latest-no-mesh
upgrade-tests_serving_main	ecf448c	link	true	/test upgrade-tests
https_serving_main	ecf448c	link	false	/test https

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[ReToCode]

@skonto now we might need to remove net-certmanager, right?

/assign @skonto

[ReToCode]

PRs to disable the automation and archive the repos are out: knative/community#1563

We might need to check if we can get rid of more stuff.