lib/libexpat: bump libbsdxml.3 after 2.7.1 import

Forgotten in fe9278888f.

Pointy hat to:	philip

lib/libexpat/libbsdxml.3

@@ -23,7 +23,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"/
-.Dd December 8, 2024
+.Dd April 7, 2025
 .Dt LIBBSDXML 3
 .Os
 .Sh NAME
@@ -34,7 +34,7 @@
 .Sh DESCRIPTION
 The
 .Nm
-library is a verbatim copy of the eXpat XML library version 2.6.4.
+library is a verbatim copy of the eXpat XML library version 2.7.1.
 .Pp
 The
 .Nm