build-sys: fix blkid date typo

Reported-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Karel Zak <kzak@redhat.com>
diff --git a/configure.ac b/configure.ac
index 2ac4c2b..7c44b09 100644
--- a/configure.ac
+++ b/configure.ac
@@ -29,7 +29,7 @@
 
 dnl libblkid version
 LIBBLKID_VERSION="$PACKAGE_VERSION_MAJOR.$PACKAGE_VERSION_MINOR.$PACKAGE_VERSION_RELEASE"
-LIBBLKID_DATE="12-Feb-2020"
+LIBBLKID_DATE="12-Feb-2021"
 LIBBLKID_LT_MAJOR=1
 LIBBLKID_LT_MINOR=1
 LIBBLKID_LT_MICRO=0