fix(tests): temporarily use relative imports in root tests

- works around: https://www.github.com/juspay/omnix/issues/425

Signed-off-by: Cameron Smith <cameron.ray.smith@gmail.com>

Author: cameronraysmith

src/python_nix_template/tests/test_main.py

@@ -1,4 +1,8 @@
-from python_nix_template import main
+# TODO: restore absolute imports when
+# https://github.com/juspay/omnix/issues/425
+# is resolved
+# from python_nix_template import main
+from .. import main
 
 
 def test_main(capsys):