bump up rootlesskit

For adding `127.0.0.1 $HOSTNAME` to /etc/hosts (rootless-containers/rootlesskit#15)

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

Author: AkihiroSuda

build/Taskfile.yml

@@ -3,7 +3,8 @@ version: '2'
 output: prefixed
 
 vars:
-  ROOTLESSKIT_COMMIT: 28cb87941b51b7e542492d763218989a5260c07d
+# 08/24/2018
+  ROOTLESSKIT_COMMIT: 5e59e1b58636c9a6a169c0ddd3ec8cb137a725bc
   SLIRP4NETNS_COMMIT: 0037042e2facc8818d0a254e320a739648283f2e
 # 08/23/2018
   MOBY_COMMIT: a0385f7ad7f8ebab4ca88e9b629a6b31423a10ee