update RootlessKit to v1.1.1

Signed-off-by: Jan Garcia <github-public@n-garcia.com>

hack/dockerfile/install/rootlesskit.installer

@@ -1,8 +1,8 @@
 #!/bin/sh
 
 # When updating, also update rootlesskit commit in vendor.mod accordingly
-# v1.1.0
-: "${ROOTLESSKIT_VERSION:=6222b477d4c3ce6eea2bcff0586e43c95d1c0bb7}"
+# v1.1.1
+: "${ROOTLESSKIT_VERSION:=a2c596ff9b3fddc0c2becb38f2ef4004f15765b5}"
 
 install_rootlesskit() {
 	case "$1" in