Fix Kind issue in Moby/Docker 27 in .devcontainer

[mathieu-benoit]

When running make kind-create-cluster or kind create cluster, with the current default/latest version of Moby/Docker 27 in .devcontainer, we get this error:

Creating cluster "kind" ...
ERROR: failed to create cluster: failed to ensure docker network: command "docker network create -d=bridge -o com.docker.network.bridge.enable_ip_masquerade=true -o com.docker.network.driver.mtu=1500 --ipv6 --subnet fc00:f853:ccd:e793::/64 kind" failed with error: exit status 1
Command Output: Error response from daemon: Failed to Setup IP tables: Unable to enable NAT rule:  (iptables failed: ip6tables --wait -t nat -I POSTROUTING -s fc00:f853:ccd:e793::/64 ! -o br-4a6862c950c4 -j MASQUERADE: ip6tables v1.8.7 (legacy): can't initialize ip6tables table `nat': Table does not exist (do you need to insmod?)
Perhaps ip6tables or your kernel needs to be upgraded.
 (exit status 3))

This fix consists to fall back to the previous version of Moby/Docker 26 working for now in .devcontainer.