chore(dependabot): bump github.com/cert-manager/cert-manager from 1.15.3 to 1.16.0 #1584

Job	Run time
Build Image / compute-tag	6s
Build Image / build-image / Build image	9m 53s
E2E (watcher-enqueue)	4m 13s
E2E (kyma-deprovision-with-foreground-propagation)	5m 9s
E2E (kyma-deprovision-with-background-propagation)	5m 55s
E2E (module-status-decoupling-with-statefulset)	6m 36s
E2E (module-status-decoupling-with-deployment)	17m 3s
E2E (kyma-metrics)	5m 58s
E2E (module-without-default-cr)	5m 27s
E2E (module-consistency)	10m 31s
E2E (non-blocking-deletion)	10m 13s
E2E (upgrade-under-deletion)	7m 46s
E2E (purge-controller)	4m 50s
E2E (purge-metrics)	4m 51s
E2E (module-upgrade-channel-switch)	5m 47s
E2E (module-upgrade-new-version)	6m 3s
E2E (unmanage-module)	7m 3s
E2E (module-install-by-version)	4m 28s
E2E (skip-manifest-reconciliation)	6m 25s
E2E (ca-certificate-rotation)	4m 41s
E2E (self-signed-certificate-rotation)	5m 19s
E2E (mandatory-module)	6m 19s
E2E (mandatory-module-metrics)	4m 32s
E2E (misconfigured-kyma-secret)	4m 25s
E2E (rbac-privileges)	3m 0s
E2E (ocm-compatible-module-template)	5m 4s
	2h 41m 37s

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