Update pyproject.toml

Author: mr-c

pyproject.toml

@@ -1,7 +1,7 @@
 [build-system]
 requires = [
     "setuptools>=45",
-    "mypy==1.5.1",  # also update mypy-requirements.txt
+    "mypy==1.6.0",  # also update mypy-requirements.txt
     "types-requests",
     "types-psutil",
     "importlib_resources>=1.4",  # equivalent to Python 3.9