firmware: point to 16.1 to prepare for transition in next release

(cherry picked from commit f30dc897)

src/etc/inc/system.inc

@@ -1371,7 +1371,7 @@ function system_firmware_configure()
 	global $config;
 
 	/* our own ABI prefix on the mirror */
-	$osabi = '15.7';
+	$osabi = '16.1';
 
 	/* rewrite the config via the defaults */
 	$origin_conf = '/usr/local/etc/pkg/repos/origin.conf';

src/etc/pkg/repos/origin.conf.sample.in

 OPNsense: {
   fingerprints: "/usr/local/etc/pkg/fingerprints/OPNsense",
-  url: "pkg+%%CORE_PACKAGESITE%%/${ABI}/15.7/%%CORE_REPOSITORY%%",
+  url: "pkg+%%CORE_PACKAGESITE%%/${ABI}/16.1/%%CORE_REPOSITORY%%",
   signature_type: "fingerprints",
   mirror_type: "srv",
   priority: 11,