uuid: Use bytes.hex instead of binascii.hexlify.

Using `bytes.hex()` eliminates an import, and eliminates the call to
`.decode()` to convert it to a str.

Also run ruff format.

Signed-off-by: Damien George <damien@micropython.org>

Author: dpgeorge

python-stdlib/uuid/uuid.py

@@ -1,20 +1,19 @@
 import os
-import ubinascii
 
 
 class UUID:
     def __init__(self, bytes):
         if len(bytes) != 16:
-            raise ValueError('bytes arg must be 16 bytes long')
+            raise ValueError("bytes arg must be 16 bytes long")
         self._bytes = bytes
 
     @property
     def hex(self):
-        return ubinascii.hexlify(self._bytes).decode()
+        return self._bytes.hex()
 
     def __str__(self):
         h = self.hex
-        return '-'.join((h[0:8], h[8:12], h[12:16], h[16:20], h[20:32]))
+        return "-".join((h[0:8], h[8:12], h[12:16], h[16:20], h[20:32]))
 
     def __repr__(self):
         return "<UUID: %s>" % str(self)