luacheck fixes

supervisor/session/rtu/unit_session.lua

@@ -166,6 +166,8 @@ function unit_session.new(session_id, unit_id, advert, out_queue, log_tag, txn_t
 
     -- PUBLIC TEMPLATE FUNCTIONS --
 
+-- luacheck push no unused args
+
     -- handle a packet
     ---@param m_pkt modbus_frame
 ---@diagnostic disable-next-line: unused-local
@@ -180,6 +182,8 @@ function unit_session.new(session_id, unit_id, advert, out_queue, log_tag, txn_t
         log.debug("template unit_session.update() called", true)
     end
 
+-- luacheck pop
+
     -- invalidate build cache
     function public.invalidate_cache()
         log.debug("template unit_session.invalidate_cache() called", true)