fix: Use .pytemplate for name for cookiecutter

This avoids conda install problem.
Fixes #1774

Author: rht

mesa/cookiecutter-mesa/hooks/post_gen_project.py

@@ -0,0 +1,11 @@
+import glob
+import os
+
+file_list = glob.glob('**/*.pytemplate', recursive=True)
+
+for file_path in file_list:
+    # Check if the file is a regular file
+    if not os.path.isfile(file_path):
+        continue
+    # Rename the file
+    os.rename(file_path, file_path.replace(".pytemplate", ".py"))