build: add GitPython as a dependency

Author: 56kyle

pyproject.toml

@@ -7,6 +7,7 @@ requires-python = ">=3.9,<4.0"
 dependencies = [
     "cookiecutter>=2.6.0",
     "cruft>=2.16.0",
+    "gitpython>=3.1.44",
     "loguru>=0.7.3",
     "platformdirs>=4.3.8",
     "retrocookie>=0.4.3",