Bump gnulib for announce-gen.

Signed-off-by: Simon Josefsson <simon@josefsson.org>

bootstrap.conf

diff --git a/bootstrap.conf b/bootstrap.conf
index 87f38a4..8a6a4e9 100644
--- a/bootstrap.conf
+++ b/bootstrap.conf
@@ -16,7 +16,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-GNULIB_REVISION=64b120efb9cad480983cb779e4fc552e5fd79230
+GNULIB_REVISION=c89cd2fbd3b9f3d7c5a146247256599714c91ec7
 
 # gnulib library name
 source_base=lib/gl