Bump pytest-timeout from 2.1.0 to 2.3.1 in /tests

Bumps [pytest-timeout](https://github.com/pytest-dev/pytest-timeout) from 2.1.0 to 2.3.1.
- [Commits](pytest-dev/pytest-timeout@2.1.0...2.3.1)

---
updated-dependencies:
- dependency-name: pytest-timeout
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

tests/constraints.txt

@@ -18,4 +18,4 @@ py>=1.9.0
 pytest>=5.0,<7.5
 pytest-dependency==0.5.1
 pytest-html==3.2.0
-pytest-timeout==2.1.0
+pytest-timeout==2.3.1