security/vuxml: adjust 12.4 range of FreeBSD SA-23:17.pf

Similar to what I did in 4826396,
adjust the 12.4 releases affected by FreeBSD SA-23:17.pf.

There is no 100% correct way to encode this issue in vuxml.  Since the
issue only affects pf.ko, freebsd-update does not rebuild the kernel.

PR:		275743
Reported by:	martin@lispworks.com

security/vuxml/vuln/2023.xml

@@ -287,7 +287,7 @@
 	<name>FreeBSD-kernel</name>
 	<range><ge>14.0</ge><lt>14.0_2</lt></range>
 	<range><ge>13.2</ge><lt>13.2_4</lt></range>
-	<range><ge>12.4</ge><lt>12.4_9</lt></range>
+	<range><ge>12.4</ge><lt>12.4_6</lt></range>
       </package>
     </affects>
     <description>
@@ -318,7 +318,7 @@
     <dates>
       <discovery>2023-12-05</discovery>
       <entry>2023-12-05</entry>
-      <modified>2023-12-07</modified>
+      <modified>2023-12-14</modified>
     </dates>
   </vuln>