build(deps): bump github.com/cert-manager/cert-manager

Bumps [github.com/cert-manager/cert-manager](https://github.com/cert-manager/cert-manager) from 1.15.3 to 1.15.4.
- [Release notes](https://github.com/cert-manager/cert-manager/releases)
- [Changelog](https://github.com/cert-manager/cert-manager/blob/master/RELEASE.md)
- [Commits](cert-manager/cert-manager@v1.15.3...v1.15.4)

---
updated-dependencies:
- dependency-name: github.com/cert-manager/cert-manager
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -4,7 +4,7 @@ go 1.23.1
 
 require (
 	dario.cat/mergo v1.0.1
-	github.com/cert-manager/cert-manager v1.15.3
+	github.com/cert-manager/cert-manager v1.15.4
 	github.com/chmike/domain v1.1.0
 	github.com/go-logr/logr v1.4.2
 	github.com/google/k8s-digester v0.1.15

go.sum

@@ -284,8 +284,8 @@ github.com/blang/semver/v4 v4.0.0/go.mod h1:IbckMUScFkM3pff0VJDNKRiT6TG/YpiHIM2y
 github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK343L8=
 github.com/cenkalti/backoff/v4 v4.3.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
-github.com/cert-manager/cert-manager v1.15.3 h1:/u9T0griwd5MegPfWbB7v0KcVcT9OJrEvPNhc9tl7xQ=
-github.com/cert-manager/cert-manager v1.15.3/go.mod h1:stBge/DTvrhfQMB/93+Y62s+gQgZBsfL1o0C/4AL/mI=
+github.com/cert-manager/cert-manager v1.15.4 h1:FtH6BOTmkNBNRjoYSW2b80MYpUq4Zw1zbEB6flYzkiM=
+github.com/cert-manager/cert-manager v1.15.4/go.mod h1:stBge/DTvrhfQMB/93+Y62s+gQgZBsfL1o0C/4AL/mI=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=