build: update gnulib submodule to latest

diff --git a/gnulib b/gnulib
index 783f2967e23e6481941c1bf1e73897c66cb4195a..f0d3a4d726d16b77b3fe7fb155b29ab792452a4f 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 783f2967e23e6481941c1bf1e73897c66cb4195a
+Subproject commit f0d3a4d726d16b77b3fe7fb155b29ab792452a4f