Bump isort from 5.13.2 to 6.0.0 (frequenz-floss#128)

Author: llucax

pyproject.toml

@@ -62,7 +62,7 @@ dev-flake8 = [
   "pydoclint == 0.6.0",
   "pydocstyle == 6.3.0",
 ]
-dev-formatting = ["black == 25.1.0", "isort == 5.13.2"]
+dev-formatting = ["black == 25.1.0", "isort == 6.0.0"]
 dev-mkdocs = [
   "black == 25.1.0",
   "Markdown==3.7",