chore: fix typo

Author: 56kyle

{{cookiecutter.project_name}}/scripts/setup-venv.py

@@ -1,6 +1,6 @@
 """Script responsible for first time setup of the project's venv.
 
-Since this a first time setup script, we intentionally only use builtin Python dependencies.
+Since this is a first time setup script, we intentionally only use builtin Python dependencies.
 """
 
 import argparse