bump up rootlesskit to v0.9.5

Supports numeric ID in /etc/subuid and /etc/subgid .
Fix #40926

Full changes: https://github.com/rootless-containers/rootlesskit/compare/v0.9.4...v0.9.5

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

hack/dockerfile/install/rootlesskit.installer

@@ -1,7 +1,7 @@
 #!/bin/sh
 
-# v0.9.4
-: ${ROOTLESSKIT_COMMIT:=0fec9adac6b078aa8616da47e9d75f663ca3f492}
+# v0.9.5
+: ${ROOTLESSKIT_COMMIT:=3f5728fbb2b6abdc63d59759e72735442ce6424e}
 
 install_rootlesskit() {
 	case "$1" in