fix(deps): update module sigs.k8s.io/controller-runtime to v0.21.0 (#1479)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

go.mod

@@ -22,7 +22,7 @@ require (
 	k8s.io/client-go v0.33.1
 	k8s.io/utils v0.0.0-20250502105355-0f33e8f1c979
 	sigs.k8s.io/cluster-api v1.10.2
-	sigs.k8s.io/controller-runtime v0.20.4
+	sigs.k8s.io/controller-runtime v0.21.0
 	sigs.k8s.io/gateway-api v1.3.0
 )
 

go.sum

@@ -284,6 +284,8 @@ sigs.k8s.io/cluster-api v1.10.2 h1:xfvtNu4Fy/41grL0ryH5xSKQjpJEWdO8HiV2lPCCozQ=
 sigs.k8s.io/cluster-api v1.10.2/go.mod h1:/b9Un5Imprib6S7ZOcJitC2ep/5wN72b0pXpMQFfbTw=
 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/gateway-api v1.3.0 h1:q6okN+/UKDATola4JY7zXzx40WO4VISk7i9DIfOvr9M=
 sigs.k8s.io/gateway-api v1.3.0/go.mod h1:d8NV8nJbaRbEKem+5IuxkL8gJGOZ+FJ+NvOIltV8gDk=
 sigs.k8s.io/json v0.0.0-20241014173422-cfa47c3a1cc8 h1:gBQPwqORJ8d8/YNZWEjoZs7npUVDpVXUUOFfW6CgAqE=