build(deps): bump pytest-timeout from 2.2.0 to 2.3.1 in /requirements

Bumps [pytest-timeout](https://github.com/pytest-dev/pytest-timeout) from 2.2.0 to 2.3.1.
- [Commits](pytest-dev/pytest-timeout@2.2.0...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>

requirements/_tests.txt

@@ -6,7 +6,7 @@ pytest ==7.4.4
 pytest-cov ==4.1.0
 pytest-doctestplus ==1.2.0
 pytest-rerunfailures ==13.0
-pytest-timeout ==2.2.0
+pytest-timeout ==2.3.1
 pytest-xdist ==3.5.0
 phmdoctest ==1.4.0