Update ruff requirement from ~=0.6.7 to ~=0.7.0 in the python group

Updates the requirements on [ruff](https://github.com/astral-sh/ruff) to permit the latest version.

Updates `ruff` to 0.7.0
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.6.7...0.7.0)

---
updated-dependencies:
- dependency-name: ruff
  dependency-type: direct:production
  dependency-group: python
...

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

pyproject.toml

@@ -23,7 +23,7 @@ dependencies = [
 [project.optional-dependencies]
 doc = []
 test = ["pytest", "pytest-cov", "pretend", "coverage[toml]"]
-lint = ["ruff ~= 0.6.9"]
+lint = ["ruff ~= 0.7.0"]
 dev = ["rfc3161-client[test,lint,doc]"]
 
 [project.urls]