Bump the python-dependencies group with 2 updates

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


Updates `pytest` from 9.1.0 to 9.1.1
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@9.1.0...9.1.1)

Updates `ruff` from 0.15.17 to 0.15.18
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.15.17...0.15.18)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.1.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: python-dependencies
- dependency-name: ruff
  dependency-version: 0.15.18
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: python-dependencies
...

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

Author: dependabot[bot]

pyproject.toml

@@ -7,7 +7,7 @@ name = "tuf-conformance"
 dependencies = [
     "securesystemslib[crypto]==1.4.0",
     "tuf==7.0.0",
-    "pytest==9.1.0",
+    "pytest==9.1.1",
     "pytest-json-report==1.5.0"
 ]
 dynamic = ["version"]
@@ -16,7 +16,7 @@ requires-python = ">= 3.10"
 [project.optional-dependencies]
 lint = [
     "mypy==2.1.0",
-    "ruff==0.15.17"
+    "ruff==0.15.18"
 ]
 
 [tool.hatch.version]