dependabot: update pytest-mock requirement from ~=3.12.0 to ~=3.14.0

Updates the requirements on [pytest-mock](https://github.com/pytest-dev/pytest-mock) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest-mock/releases)
- [Changelog](https://github.com/pytest-dev/pytest-mock/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-mock@v3.12.0...v3.14.0)

---
updated-dependencies:
- dependency-name: pytest-mock
  dependency-type: direct:production
...

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

requirements_test.txt

@@ -1,4 +1,4 @@
 # Testing requirements
 blinker~=1.7
 pytest~=8.2.0
-pytest-mock~=3.12.0
+pytest-mock~=3.14.0