update RootlessKit to v2.3.4

Contains a fix for Ubuntu 25.04
https://github.com/rootless-containers/rootlesskit/releases/tag/v2.3.3
https://github.com/rootless-containers/rootlesskit/releases/tag/v2.3.4

Signed-off-by: Akihiro Suda <[email protected]>

Author: AkihiroSuda

Dockerfile

@@ -6,7 +6,7 @@ ARG CONTAINERD_VERSION=v2.0.2
 ARG CONTAINERD_ALT_VERSION_17=v1.7.25
 ARG CONTAINERD_ALT_VERSION_16=v1.6.36
 ARG REGISTRY_VERSION=v2.8.3
-ARG ROOTLESSKIT_VERSION=v2.3.2
+ARG ROOTLESSKIT_VERSION=v2.3.4
 ARG CNI_VERSION=v1.5.1
 ARG STARGZ_SNAPSHOTTER_VERSION=v0.15.1
 ARG NERDCTL_VERSION=v1.6.2