Skip PyPy tests due to heatshrink2's Cython usage

See:

- rytilahti#1021 (comment)
- https://foss.heptapod.net/pypy/pypy/-/issues/3039
- cython/cython#3448

miio/tests/test_chuangmi_ir.py

@@ -1,6 +1,7 @@
 import base64
 import json
 import os
+import platform
 from unittest import TestCase
 
 import pytest
@@ -10,6 +11,11 @@
 
 from .dummies import DummyDevice
 
+pytestmark = pytest.mark.skipif(
+    platform.python_implementation() == "PyPy",
+    reason="heatshrink2 does not support pypy",
+)
+
 with open(os.path.join(os.path.dirname(__file__), "test_chuangmi_ir.json")) as inp:
     test_data = json.load(inp)