UPSTREAM: <carry>: Backport IP and CIDR CEL base for 1.28

This commit needs to be carried until we rebase onto Kube 1.31.

We have backported the library changes to 1.28, which means they can then be used in 1.29.

Upstream, they were only introduced in 1.30 which means they wouldn't be usable until 1.31.

This allows us to improve our API validation from OpenShift 4.16 onwards, instead of OpenShift 4.18 onwards.

staging/src/k8s.io/apiserver/pkg/cel/environment/base.go

@@ -124,7 +124,7 @@ var baseOpts = []VersionedOptions{
 		},
 	},
 	{
-		IntroducedVersion: version.MajorMinor(1, 30),
+		IntroducedVersion: version.MajorMinor(1, 28),
 		EnvOptions: []cel.EnvOption{
 			library.IP(),
 			library.CIDR(),