Increase K8s version for e2e tests to v1.29.2

The previous version of K8s used for testing was v1.21 and hadn't
been updated for a long time. This change makes the e2e tests
run with the most recent patch at time of writing.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

contrib/create_cluster.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 DEVENV=${OF_DEV_ENV:-kind}
-KUBE_VERSION=v1.21.1
+KUBE_VERSION=v1.29.2
 
 EXISTS=$(kind get clusters | grep "$DEVENV")