fix(go.mod/go.sum): update module sigs.k8s.io/controller-runtime to v0.21.0

Author: renovate[bot]

go.mod

@@ -18,7 +18,7 @@ require (
 	k8s.io/client-go v0.33.1
 	k8s.io/code-generator v0.33.1
 	k8s.io/kube-aggregator v0.33.1
-	sigs.k8s.io/controller-runtime v0.20.4
+	sigs.k8s.io/controller-runtime v0.21.0
 	sigs.k8s.io/controller-runtime/tools/setup-envtest v0.0.0-20250514162319-85ee7a9efa4b
 	sigs.k8s.io/controller-tools v0.18.0
 	sigs.k8s.io/yaml v1.4.0

go.sum

@@ -539,6 +539,8 @@ sigs.k8s.io/cli-utils v0.37.2 h1:GOfKw5RV2HDQZDJlru5KkfLO1tbxqMoyn1IYUxqBpNg=
 sigs.k8s.io/cli-utils v0.37.2/go.mod h1:V+IZZr4UoGj7gMJXklWBg6t5xbdThFBcpj4MrZuCYco=
 sigs.k8s.io/controller-runtime v0.20.4 h1:X3c+Odnxz+iPTRobG4tp092+CvBU9UK0t/bRf+n0DGU=
 sigs.k8s.io/controller-runtime v0.20.4/go.mod h1:xg2XB0K5ShQzAgsoujxuKN4LNXR2LfwwHsPj7Iaw+XY=
+sigs.k8s.io/controller-runtime v0.21.0 h1:CYfjpEuicjUecRk+KAeyYh+ouUBn4llGyDYytIGcJS8=
+sigs.k8s.io/controller-runtime v0.21.0/go.mod h1:OSg14+F65eWqIu4DceX7k/+QRAbTTvxeQSNSOQpukWM=
 sigs.k8s.io/controller-runtime/tools/setup-envtest v0.0.0-20250514162319-85ee7a9efa4b h1:XhWcJ1uA5bmrca1B7L0LG5QNKZaQAkBdCjfT86f1wqE=
 sigs.k8s.io/controller-runtime/tools/setup-envtest v0.0.0-20250514162319-85ee7a9efa4b/go.mod h1:zxemiV1fQ3IJnXX0VeOb6qbHp2Wtv3s1w+gftNeHWTg=
 sigs.k8s.io/controller-tools v0.18.0 h1:rGxGZCZTV2wJreeRgqVoWab/mfcumTMmSwKzoM9xrsE=