Bump helm.sh/helm/v3 from 3.18.0 to 3.18.1 in /tests (#599)

Bumps [helm.sh/helm/v3](https://github.com/helm/helm) from 3.18.0 to 3.18.1.
- [Release notes](https://github.com/helm/helm/releases)
- [Commits](https://github.com/helm/helm/compare/v3.18.0...v3.18.1)

---
updated-dependencies:
- dependency-name: helm.sh/helm/v3
  dependency-version: 3.18.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

tests/go.mod

@@ -7,7 +7,7 @@ toolchain go1.24.1
 require (
 	github.com/onsi/ginkgo/v2 v2.23.4
 	github.com/onsi/gomega v1.37.0
-	helm.sh/helm/v3 v3.18.0
+	helm.sh/helm/v3 v3.18.1
 )
 
 require (

tests/go.sum

@@ -173,8 +173,8 @@ gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-helm.sh/helm/v3 v3.18.0 h1:ItOAm3Quo0dus3NUHjs+lluqWWEIO7xrSW+zKWCrvlw=
-helm.sh/helm/v3 v3.18.0/go.mod h1:43QHS1W97RcoFJRk36ZBhHdTfykqBlJdsWp3yhzdq8w=
+helm.sh/helm/v3 v3.18.1 h1:qLhXmtqXOHQb0Xv9HJolOLlah8RWbgyzt50xrtTWAlg=
+helm.sh/helm/v3 v3.18.1/go.mod h1:43QHS1W97RcoFJRk36ZBhHdTfykqBlJdsWp3yhzdq8w=
 k8s.io/api v0.33.0 h1:yTgZVn1XEe6opVpP1FylmNrIFWuDqe2H0V8CT5gxfIU=
 k8s.io/api v0.33.0/go.mod h1:CTO61ECK/KU7haa3qq8sarQ0biLq2ju405IZAd9zsiM=
 k8s.io/apiextensions-apiserver v0.33.0 h1:d2qpYL7Mngbsc1taA4IjJPRJ9ilnsXIrndH+r9IimOs=