add pytest mock to dev dependencies

Author: pattonw

pyproject.toml

@@ -35,7 +35,7 @@ dependencies = [
 version = { attr = "funlib.persistence.__version__" }
 
 [project.optional-dependencies]
-dev = ['coverage>=5.0.3', 'pytest', 'black', 'mypy', 'types-psycopg2', 'types-toml']
+dev = ['coverage>=5.0.3', 'pytest', 'pytest-mock', 'black', 'mypy', 'types-psycopg2', 'types-toml']
 
 [tool.ruff]
 # pyflakes, pycodestyle, isort