[py]: bump isort version. Document 6+ requires py3.8+

Author: symonk

py/tox.ini

@@ -35,8 +35,9 @@ force_single_line = True
 ; checks linting for CI with stricter exiting when failing.
 skip_install = true
 deps =
-  isort==5.10.1
+  isort==5.11.2
   black==22.12.0
+  ; flake8 6+ requires python3.8+ specifically.
   flake8==5.0.4
   flake8-typing-imports==1.14.0
   docformatter==1.5.0
@@ -54,8 +55,9 @@ commands =
 ; IMPORTANT: black & isort rewrite files, flake8 merely alerts to the failure.
 skip_install = true
 deps =
-  isort==5.10.1
+  isort==5.11.2
   black==22.12.0
+  ; flake8 6+ requires python3.8+ specifically.
   flake8==5.0.4
   flake8-typing-imports==1.14.0
   docformatter==1.5.0