Bump the dev-dependencies group with 2 updates

Bumps the dev-dependencies group with 2 updates: [pytest-cov](https://github.com/pytest-dev/pytest-cov) and [ruff](https://github.com/astral-sh/ruff).


Updates `pytest-cov` from 5.0.0 to 6.0.0
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v5.0.0...v6.0.0)

Updates `ruff` from 0.8.1 to 0.8.4
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.8.1...0.8.4)

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

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

Author: dependabot[bot]

poetry.lock

@@ -26,7 +26,7 @@ typing-extensions = "*"
 
 [tool.poetry.group.dev.dependencies]
 pytest = ">=7.4,<9.0"
-pytest-cov = ">=4.1,<6.0"
+pytest-cov = ">=4.1,<7.0"
 pytest-timeout = "^2.0.1"
 ruff = ">=0.4.7,<0.9.0"
 customtkinter = "^5.2.1"