prefer platformdirs if available

pyopencl/cache.py

@@ -325,7 +325,11 @@ def _create_built_program_from_source_cached(ctx, src, options_bytes,
     from os.path import join
 
     if cache_dir is None:
-        import appdirs
+        try:
+            import platformdirs as appdirs
+        except ImportError:
+            import appdirs
+
         cache_dir = join(appdirs.user_cache_dir("pyopencl", "pyopencl"),
                 "pyopencl-compiler-cache-v2-py{}".format(
                     ".".join(str(i) for i in sys.version_info)))

setup.py

@@ -257,7 +257,7 @@ def main():
             install_requires=[
                 "numpy",
                 "pytools>=2021.2.7",
-                "appdirs>=1.4.0",
+                "platformdirs>=2.2.0",
                 # "Mako>=0.3.6",
                 ],
             extras_require={