update RootlessKit to v1.1.0

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

hack/dockerfile/install/rootlesskit.installer

@@ -1,8 +1,8 @@
 #!/bin/sh
 
 # When updating, also update rootlesskit commit in vendor.conf accordingly
-# v1.0.0
-: "${ROOTLESSKIT_VERSION:=1920341cd41e047834a21007424162a2dc946315}"
+# v1.1.0
+: "${ROOTLESSKIT_VERSION:=6222b477d4c3ce6eea2bcff0586e43c95d1c0bb7}"
 
 install_rootlesskit() {
 	case "$1" in