build: update gnulib submodule to latest

diff --git a/gnulib b/gnulib
index ba9136b7646ef9e01ffad3ddcf232002354531d0..74b6a2a7386cf8586c1244297d4d87dde123db42 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit ba9136b7646ef9e01ffad3ddcf232002354531d0
+Subproject commit 74b6a2a7386cf8586c1244297d4d87dde123db42