Bump github.com/cert-manager/cert-manager

Bumps the go_modules group with 1 update in the / directory: [github.com/cert-manager/cert-manager](https://github.com/cert-manager/cert-manager).


Updates `github.com/cert-manager/cert-manager` from 1.15.1 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](https://github.com/cert-manager/cert-manager/compare/v1.15.1...v1.15.4)

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

Signed-off-by: dependabot[bot] <support@github.com>

go.sum

@@ -10,8 +10,8 @@ github.com/blang/semver/v4 v4.0.0 h1:1PFHFE6yCCTv8C1TeyNNarDzntLi7wMI5i/pzqYIsAM
 github.com/blang/semver/v4 v4.0.0/go.mod h1:IbckMUScFkM3pff0VJDNKRiT6TG/YpiHIM2yvyW5YoQ=
 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/cert-manager/cert-manager v1.15.1 h1:HSG4k2GlJ2YgTLkZfQzrArNaQpM9+ehDDg550IxAD94=
-github.com/cert-manager/cert-manager v1.15.1/go.mod h1:p98JoGv3J9JhdKU9ngsj2EhWGI6/GlU7kpjWu5lf2js=
+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/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/coreos/go-semver v0.3.1 h1:yi21YpKnrx1gt5R+la8n5WgS0kCrsPp33dmEyHReZr4=