Update dependency isort to v6

Author: renovate[bot]

requirements.txt

@@ -6,7 +6,7 @@ dill==0.3.9
 exceptiongroup==1.2.2
 flake8==7.1.1
 iniconfig==2.0.0
-isort==5.13.2
+isort==6.0.0
 lazy-object-proxy==1.10.0
 mccabe==0.7.0
 nodeenv==1.9.1