List some first/third party libraries

Without doing this, there was some conflict between the `tox -e format`
job and the pre-commit hooks about whether there should be an extra line
after "click".

Author: pganssle

pyproject.toml

@@ -6,6 +6,9 @@ build-backend = "setuptools.build_meta"
 atomic=true
 force_grid_wrap=0
 include_trailing_comma=true
+known_first_party=["tzdata"]
+known_standard_library=["zoneinfo"]
+known_third_party=["click", "parver", "pytest", "requests"]
 multi_line_output=3
 not_skip="__init__.py"
 use_parentheses=true