deps: update tox requirement from ~=4.13 to ~=4.56

Updates the requirements on [tox](https://github.com/tox-dev/tox) to permit the latest version.
- [Release notes](https://github.com/tox-dev/tox/releases)
- [Changelog](https://github.com/tox-dev/tox/blob/main/docs/changelog.rst)
- [Commits](tox-dev/tox@4.13.0...4.56.4)

---
updated-dependencies:
- dependency-name: tox
  dependency-version: 4.56.4
  dependency-type: direct:development
...

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

Author: dependabot[bot]

pyproject.toml

@@ -41,7 +41,7 @@ dbt-score = "dbt_score.__main__:main"
 dev = [
     "dbt-core>=1.5",
     "tox-uv~=1.35",
-    "tox~=4.13",
+    "tox~=4.56",
 ]
 lint = [
     "ruff~=0.15.12",