Deprecate GPS format

meshtastic/config.proto

@@ -683,9 +683,10 @@ message Config {
     uint32 screen_on_secs = 1;
 
     /*
+     * Deprecated in 2.7.4: Unused
      * How the GPS coordinates are formatted on the OLED screen.
      */
-    GpsCoordinateFormat gps_format = 2;
+    GpsCoordinateFormat gps_format = 2 [deprecated = true];
 
     /*
      * Automatically toggles to the next page on the screen like a carousel, based the specified interval in seconds.