Suppress new GCC 12 warning (#842)

src/rp2_common/pico_platform/include/pico/platform.h

@@ -336,7 +336,10 @@ uint8_t rp2040_chip_version(void);
  * @return the RP2040 rom version number (1 for RP2040-B0, 2 for RP2040-B1, 3 for RP2040-B2)
  */
 static inline uint8_t rp2040_rom_version(void) {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Warray-bounds"
     return *(uint8_t*)0x13;
+#pragma GCC diagnostic pop
 }
 
 /*! \brief No-op function for the body of tight loops