build: update gnulib submodule to latest

diff --git a/gnulib b/gnulib
index 0ac98783691bbf8212537ebe18ddb68feb22a760..69822de4243b40e1da10046e1c12e79703ea9a7d 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 0ac98783691bbf8212537ebe18ddb68feb22a760
+Subproject commit 69822de4243b40e1da10046e1c12e79703ea9a7d