Don't install (nor run) mypy on PyPy (librt build failures) (#187)

---------

Co-authored-by: Jason R. Coombs <jaraco@jaraco.com>

Author: Avasam

pyproject.toml

@@ -63,10 +63,9 @@ enabler = [
 
 type = [
 	# upstream
-	"pytest-mypy >= 1.0.1",
-
-	## workaround for python/mypy#20454
-	"mypy < 1.19; python_implementation == 'PyPy'",
+	
+    # Exclude PyPy from type checks (python/mypy#20454 jaraco/skeleton#187)
+	"pytest-mypy >= 1.0.1; platform_python_implementation != 'PyPy'",
 
 	# local
 ]