fix(deps): update module github.com/cert-manager/cert-manager to v1.18.1

Author: ibm-mend-app[bot]

go.mod

@@ -6,7 +6,7 @@ toolchain go1.24.4
 
 require (
 	github.com/IBM-Cloud/bluemix-go v0.0.0-20250409011132-bdd4531aaa04
-	github.com/cert-manager/cert-manager v1.18.0
+	github.com/cert-manager/cert-manager v1.18.1
 	k8s.io/apiextensions-apiserver v0.33.1
 	k8s.io/client-go v0.33.1
 )

go.sum

@@ -15,6 +15,8 @@ github.com/cenkalti/backoff/v5 v5.0.2 h1:rIfFVxEf1QsI7E1ZHfp/B4DF/6QBAUhmgkxc0H7
 github.com/cenkalti/backoff/v5 v5.0.2/go.mod h1:rkhZdG3JZukswDf7f0cwqPNk4K0sa+F97BxZthm/crw=
 github.com/cert-manager/cert-manager v1.18.0 h1:v7vxC1Mx5tkDz1oGOAktB88zA6TbGKcmpLM92+AIXRc=
 github.com/cert-manager/cert-manager v1.18.0/go.mod h1:icDJx4kG9BCNpGjBvrmsFd99d+lXUvWdkkcrSSQdIiw=
+github.com/cert-manager/cert-manager v1.18.1 h1:5qa3UNrgkNc5Zpn0CyAVMyRIchfF3/RHji4JrazYmWw=
+github.com/cert-manager/cert-manager v1.18.1/go.mod h1:icDJx4kG9BCNpGjBvrmsFd99d+lXUvWdkkcrSSQdIiw=
 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/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=