[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 ebee08e...c6be221:
  > c6be221 Update community files (# 582)

[knative-prow]

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

Test name	Commit	Details	Required	Rerun command
https_serving_main	d69ea35	link	false	/test https

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[dprotaso]

/retest
/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, knative-automation

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