Update libraries/Arduino_CAN/src/R7FA4M1_CAN.h

Co-authored-by: Alexander Entinger <consulting@lxrobotics.com>

Author: Woodwarth

libraries/Arduino_CAN/src/R7FA4M1_CAN.h

@@ -55,7 +55,7 @@ class R7FA4M1_CAN final : public HardwareCAN
   void end() override;
 
   void setMailboxMask(size_t const mailbox_group,uint32_t const mask);
-  void setMailboxID(int mailbox,int id);
+  void setMailboxID(size_t const mailbox, uint32_t const id);
 
   int enableInternalLoopback();
   int disableInternalLoopback();