build(deps-dev): update pytest requirement from <9,>=8 to >=8,<10

Updates the requirements on [pytest](https://github.com/pytest-dev/pytest) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@8.0.0...9.0.3)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.0.3
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -30,7 +30,7 @@ desktop = ["pywebview>=5.0,<6"]
 
 # Development tooling: testing + type checking.
 dev = [
-    "pytest>=8,<9",
+    "pytest>=8,<10",
     "mypy>=1.10,<2",
 ]