Updates utils-git: 8b56dfa Avoid detached HEAD

diff --git a/utils-git b/utils-git
index 1cde5d6f043cd3fb29ec4d60827c66e9a19ed405..8b56dface439ff13c9977d958b891bfb79b09850 160000 (submodule)
--- a/utils-git
+++ b/utils-git
@@ -1 +1 @@
-Subproject commit 1cde5d6f043cd3fb29ec4d60827c66e9a19ed405
+Subproject commit 8b56dface439ff13c9977d958b891bfb79b09850