Bump pytest-mock from 3.11.1 to 3.12.0 in /etc/requirements_dependabot

Bumps [pytest-mock](https://github.com/pytest-dev/pytest-mock) from 3.11.1 to 3.12.0.
- [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@v3.11.1...v3.12.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

etc/requirements_dependabot/requirements_tests.txt

@@ -93,7 +93,7 @@ pytest==7.4.2
     # via
     #   market-prices (pyproject.toml)
     #   pytest-mock
-pytest-mock==3.11.1
+pytest-mock==3.12.0
     # via market-prices (pyproject.toml)
 python-dateutil==2.8.2
     # via