fix: Add isort and fix errors in dockerfiles

Author: Dominik Falkner

{{ cookiecutter.__package_name_kebab_case }}/pyproject.toml

@@ -35,6 +35,7 @@ python = "^{{ cookiecutter.python_version }}"
 poethepoet = "^0.20.0"
 black = { version = "^23.3.0", extras = ["jupyter"] }
 ruff = "^0.0.272"
+isort = "^5.12.0"
 pytest = "^7.3.2"
 pytest-clarity = "^1.0.1"
 pytest-cov = "4.1.0"