Continue skipping SCTP HostPort tests in older k8s versions

After no longer skipping these in kops 1.28, the e2e tests began failing again.

It turns out cilium doesn't enable SCTP support by default, it is guarded by a `enable-sctp` config boolean.
In k8s 1.27 the test was also renamed and added [Serial], so it is still being skipped on k8s 1.27+ test jobs

tests/e2e/pkg/tester/skip_regex.go

@@ -84,11 +84,17 @@ func (t *Tester) setSkipRegexFlag() error {
 		if isPre28 {
 			// These may be fixed in Cilium 1.13 but skipping for now
 			skipRegex += "|Service.with.multiple.ports.specified.in.multiple.EndpointSlices"
-			skipRegex += "|should.create.a.Pod.with.SCTP.HostPort"
 			// https://github.com/cilium/cilium/issues/18241
 			skipRegex += "|Services.should.create.endpoints.for.unready.pods"
 			skipRegex += "|Services.should.be.able.to.connect.to.terminating.and.unready.endpoints.if.PublishNotReadyAddresses.is.true"
 		}
+		if k8sVersion.Minor < 27 {
+			// Partially implemented in Cilium 1.13 but kops doesn't enable it
+			// Ref: https://github.com/cilium/cilium/pull/20033
+			// K8s 1.27+ added [Serial] to the test case, which is skipped by default
+			// Ref: https://github.com/kubernetes/kubernetes/pull/113335
+			skipRegex += "|should.create.a.Pod.with.SCTP.HostPort"
+		}
 	} else if networking.KubeRouter != nil {
 		skipRegex += "|load-balancer|hairpin|affinity\\stimeout|service\\.kubernetes\\.io|CLOSE_WAIT"
 		skipRegex += "|EndpointSlice.should.support.a.Service.with.multiple"