Bump k8s.io/code-generator from 0.26.5 to 0.28.4

Bumps [k8s.io/code-generator](https://github.com/kubernetes/code-generator) from 0.26.5 to 0.28.4.
- [Commits](kubernetes/code-generator@v0.26.5...v0.28.4)

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

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

go.mod

@@ -32,7 +32,7 @@ require (
 	k8s.io/api v0.28.3
 	k8s.io/apimachinery v0.28.3
 	k8s.io/client-go v0.28.3
-	k8s.io/code-generator v0.26.5
+	k8s.io/code-generator v0.28.4
 	k8s.io/kube-openapi v0.0.0-20231010175941-2dd684a91f00
 	knative.dev/pkg v0.0.0-20230821102121-81e4ee140363
 )

go.sum

@@ -2030,8 +2030,8 @@ k8s.io/client-go v0.28.3 h1:2OqNb72ZuTZPKCl+4gTKvqao0AMOl9f3o2ijbAj3LI4=
 k8s.io/client-go v0.28.3/go.mod h1:LTykbBp9gsA7SwqirlCXBWtK0guzfhpoW4qSm7i9dxo=
 k8s.io/cloud-provider v0.22.4/go.mod h1:lTaIKDEqJt7UPbsz9sk1Aa719ADIWuFtbh/mgq72UE8=
 k8s.io/cloud-provider v0.23.9/go.mod h1:pvwJIqXO2VdS5BH7O1kDJ0YNGLR2VF3g1H5vl8iZ9ak=
-k8s.io/code-generator v0.26.5 h1:0p350mqxkbs29h8/yF4AMilApLVUhnRx3EAfhTWR5fY=
-k8s.io/code-generator v0.26.5/go.mod h1:iWTVFxfBX+RYe0bXjKqSM83KJF8eimor/izQInvq/60=
+k8s.io/code-generator v0.28.4 h1:tcOSNIZQvuAvXhOwpbuJkKbAABJQeyCcQBCN/3uI18c=
+k8s.io/code-generator v0.28.4/go.mod h1:OQAfl6bZikQ/tK6faJ18Vyzo54rUII2NmjurHyiN1g4=
 k8s.io/component-base v0.22.4/go.mod h1:MrSaQy4a3tFVViff8TZL6JHYSewNCLshZCwHYM58v5A=
 k8s.io/component-base v0.23.9/go.mod h1:WUNtIRIMd9WBS2r5LCSNZoh6f/Uh+8O+aGuZUG5t428=
 k8s.io/component-helpers v0.23.9/go.mod h1:avq4d71ORmz8QkIJ+uSIZ6+z9vbhEY+8KRyT9dBv0GA=