define specific Python version

Author: PaulNGilson

.replit

@@ -7,6 +7,7 @@ entrypoint = "main.py"
 # A list of globs that specify which files and directories should
 # be hidden in the workspace.
 hidden = ["venv", ".config", "**/__pycache__", "**/.mypy_cache", "**/*.pyc", "999_video_index.md"]
+modules = ["python-3.10:v18-20230807-322e88b"]
 
 # Specifies which nix channel to use when building the environment.
 [nix]