chore(deps): bump github.com/cert-manager/cert-manager from 1.15.2 to 1.15.4 #2971

Job	Run time
Check (1.23.x, false)	2m 48s
API Integration Tests (1.23.x, false)	7m 47s
CLI Integration Tests (1.23.x, false)	8m 59s
Test (1.23.x, false)	8m 26s
CLI tests (test-all-operators) / CLI test-all-operators	8m 37s
CLI tests (test-mongo-operator) / CLI test-mongo-operator	7m 15s
CLI tests (test-namespaces) / CLI test-namespaces	10m 21s
CLI tests (test-pg-operator) / CLI test-pg-operator	8m 2s
CLI tests (test-pxc-operator) / CLI test-pxc-operator	7m 16s
Merge Gatekeeper	14s
	1h 9m 45s

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