py/persistentcode: Bump .mpy version to 4.

py/persistentcode.c

@@ -41,7 +41,7 @@
 #define QSTR_LAST_STATIC MP_QSTR_zip
 
 // The current version of .mpy files
-#define MPY_VERSION (3)
+#define MPY_VERSION (4)
 
 // Macros to encode/decode flags to/from the feature byte
 #define MPY_FEATURE_ENCODE_FLAGS(flags) (flags)

tools/mpy-tool.py

@@ -57,7 +57,7 @@ class FreezeError(Exception):
         return 'error while freezing %s: %s' % (self.rawcode.source_file, self.msg)
 
 class Config:
-    MPY_VERSION = 3
+    MPY_VERSION = 4
     MICROPY_LONGINT_IMPL_NONE = 0
     MICROPY_LONGINT_IMPL_LONGLONG = 1
     MICROPY_LONGINT_IMPL_MPZ = 2