build: update gnulib submodule to latest

diff --git a/gnulib b/gnulib
index 95713c0087424c99a6ba81d3c1b768814fd9371a..8f292d0931b1e1f7c5a063bd400ff9dabb3897ff 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 95713c0087424c99a6ba81d3c1b768814fd9371a
+Subproject commit 8f292d0931b1e1f7c5a063bd400ff9dabb3897ff