Update isort to v5.5.4 in pre-commit

Required changes to the configuration to stop using deprecated modules,
and to avoid isort thinking that everything in the standard library
*except* `zoneinfo` was actually a third-party package.

This also pins the minimum isort at 5.0.0 in tox.

Author: pganssle

.pre-commit-config.yaml

@@ -6,7 +6,7 @@ repos:
         language_version: python3.8
 
   - repo: https://github.com/pre-commit/mirrors-isort
-    rev: v4.3.21
+    rev: v5.5.4
     hooks:
       - id: isort
         additional_dependencies: [toml]

docs/conf.py

@@ -5,6 +5,7 @@
 # https://www.sphinx-doc.org/en/master/usage/configuration.html
 
 import sphinx_bootstrap_theme
+
 import tzdata
 
 # -- Project information -----------------------------------------------------

pyproject.toml

@@ -7,8 +7,7 @@ atomic=true
 force_grid_wrap=0
 include_trailing_comma=true
 known_first_party=["tzdata"]
-known_standard_library=["zoneinfo"]
+extra_standard_library=["zoneinfo"]
 known_third_party=["click", "parver", "pytest", "requests"]
 multi_line_output=3
-not_skip="__init__.py"
 use_parentheses=true

tox.ini

@@ -54,7 +54,7 @@ description = Run auto formatters
 skip_install = True
 deps =
     black
-    isort
+    isort >= 5.0.0
 commands =
     black .
     isort update.py