Support isort 9 (#11352)

Closes #11351

Author: Pierre-Sassoulas

.pre-commit-config.yaml

@@ -42,7 +42,7 @@ repos:
         exclude: tests(/\w*)*/functional/|tests/input|doc/data/messages|examples/|setup.py|tests(/\w*)*data/
         types: [python]
   - repo: https://github.com/PyCQA/isort
-    rev: 9.0.0b5
+    rev: 9.0.0
     hooks:
       - id: isort
         exclude: doc/data/messages/

doc/whatsnew/fragments/11351.other

@@ -0,0 +1,3 @@
+Upgrade the ``isort`` upper bound so ``isort`` 9 can be installed alongside pylint.
+
+Closes #11351

pyproject.toml

@@ -47,7 +47,7 @@ dependencies = [
   "dill>=0.2; python_version<'3.11'",
   "dill>=0.3.6; python_version>='3.11'",
   "dill>=0.3.7; python_version>='3.12'",
-  "isort>=5,!=5.13,<9",
+  "isort>=5,!=5.13,<10",
   "mccabe>=0.6,<0.8",
   "platformdirs>=2.2",
   "tomli>=1.1; python_version<'3.11'",