Widen pytest version upper bound to accept v9.x

Signed-off-by: Leandro Lucarella <luca-frequenz@llucax.com>

Author: llucax

RELEASE_NOTES.md

@@ -1,37 +1,5 @@
 # Frequenz Repository Configuration Release Notes
 
-## Summary
-
-<!-- Here goes a general summary of what this release is about -->
-
-## Upgrading
-
-<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
-
-### Cookiecutter template
-
-All upgrading should be done via the migration script or regenerating the templates.
-
-```bash
-curl -sSL https://raw.githubusercontent.com/frequenz-floss/frequenz-repo-config-python/v0.12/cookiecutter/migrate.py | python3
-```
-
-But you might still need to adapt your code:
-
-<!-- Here upgrade steps for cookiecutter specifically -->
-
 ## New Features
 
-* Pylint4 is now supported.
-
-### Cookiecutter template
-
-- Dependencies have been updated.
-
-## Bug Fixes
-
-<!-- Here goes notable bug fixes that are worth a special mention or explanation -->
-
-### Cookiecutter template
-
-<!-- Here bug fixes for cookiecutter specifically -->
+* Pytest v9.x is now supported.

pyproject.toml

@@ -64,7 +64,7 @@ lib = []
 model = []
 extra-lint-examples = [
   "pylint >= 2.17.3, < 5",
-  "pytest >= 7.3.0, < 9",
+  "pytest >= 7.3.0, < 10",
   "sybil >= 6.1.1, < 10",
 ]
 dev-flake8 = [