lal: bump library api version for 7.3.1

lal/configure.ac

@@ -20,7 +20,7 @@ AC_CONFIG_MACRO_DIR([gnuscripts])
 # 6. if any interfaces have been removed since the last public release,
 #    then set age to 0.
 AC_SUBST([LIBCURRENT],[23])
-AC_SUBST([LIBREVISION],[0])
+AC_SUBST([LIBREVISION],[1])
 AC_SUBST([LIBAGE],[3])
 AC_SUBST([LIBVERSION],[${LIBCURRENT}:${LIBREVISION}:${LIBAGE}])
 AS_CASE([${host_os}],