🌱 Bump k8s.io/code-generator in /hack/tools

Bumps [k8s.io/code-generator](https://github.com/kubernetes/code-generator) from 0.28.2 to 0.28.3.
- [Commits](kubernetes/code-generator@v0.28.2...v0.28.3)

---
updated-dependencies:
- dependency-name: k8s.io/code-generator
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

hack/tools/go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/drone/envsubst v1.0.3
 	github.com/golang/mock v1.6.0
 	github.com/jteeuwen/go-bindata v3.0.7+incompatible
-	k8s.io/code-generator v0.28.2
+	k8s.io/code-generator v0.28.3
 	sigs.k8s.io/controller-runtime/tools/setup-envtest v0.0.0-20230510161459-7571f4b9a942
 	sigs.k8s.io/controller-tools v0.12.1
 	sigs.k8s.io/kustomize/kustomize/v5 v5.1.1

hack/tools/go.sum

@@ -596,8 +596,8 @@ k8s.io/apiextensions-apiserver v0.27.1 h1:Hp7B3KxKHBZ/FxmVFVpaDiXI6CCSr49P1OJjxK
 k8s.io/apiextensions-apiserver v0.27.1/go.mod h1:8jEvRDtKjVtWmdkhOqE84EcNWJt/uwF8PC4627UZghY=
 k8s.io/apimachinery v0.27.1 h1:EGuZiLI95UQQcClhanryclaQE6xjg1Bts6/L3cD7zyc=
 k8s.io/apimachinery v0.27.1/go.mod h1:5ikh59fK3AJ287GUvpUsryoMFtH9zj/ARfWCo3AyXTM=
-k8s.io/code-generator v0.28.2 h1:u47guga1rCWLnEnffF09p+cqj8B20oHOLoQ1lb1HGtQ=
-k8s.io/code-generator v0.28.2/go.mod h1:ueeSJZJ61NHBa0ccWLey6mwawum25vX61nRZ6WOzN9A=
+k8s.io/code-generator v0.28.3 h1:I847QvdpYx7xKiG2KVQeCSyNF/xU9TowaDAg601mvlw=
+k8s.io/code-generator v0.28.3/go.mod h1:A2EAHTRYvCvBrb/MM2zZBNipeCk3f8NtpdNIKawC43M=
 k8s.io/gengo v0.0.0-20220902162205-c0856e24416d h1:U9tB195lKdzwqicbJvyJeOXV7Klv+wNAWENRnXEGi08=
 k8s.io/gengo v0.0.0-20220902162205-c0856e24416d/go.mod h1:FiNAH4ZV3gBg2Kwh89tzAEV2be7d5xI0vBa/VySYy3E=
 k8s.io/klog/v2 v2.2.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y=