Bump the dev-dependencies group with 2 updates

Bumps the dev-dependencies group with 2 updates: [pytest](https://github.com/pytest-dev/pytest) and [black](https://github.com/psf/black).


Updates `pytest` from 7.4.4 to 8.0.0
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@7.4.4...8.0.0)

Updates `black` from 23.12.1 to 24.1.1
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@23.12.1...24.1.1)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: dev-dependencies
- dependency-name: black
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: dev-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -25,11 +25,11 @@ customtkinter = {version = "^5.2.1", optional = true}
 typing-extensions = ">=4.7.0,<=5.0"
 
 [tool.poetry.group.dev.dependencies]
-pytest = "^7.4.0"
+pytest = ">=7.4,<9.0"
 pytest-cov = "^4.1.0"
 pytest-timeout = "^2.0.1"
 flake8 = "^5.0.4"
-black = "^23.3.0"
+black = ">=23.3,<25.0"
 isort = "^5.11.5"
 customtkinter = "^5.2.1"