maint: update gnulib to latest

diff --git a/gnulib b/gnulib
index 1c5e0277c2143dd570d8c88f8923eed2afd8e13b..83730551b451b43577531986a5c4300e0166c42f 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 1c5e0277c2143dd570d8c88f8923eed2afd8e13b
+Subproject commit 83730551b451b43577531986a5c4300e0166c42f