Update pytest-mock requirement from ==3.10.* to ==3.12.* (#3901)

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](https://github.com/pytest-dev/pytest-mock/compare/v3.10.0...v3.12.0)

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

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pyproject.toml

@@ -124,7 +124,7 @@ dev = [
   "pytest-cache",
   "pytest-cov",
   "pytest-django==4.*",
-  "pytest-mock==3.10.*",
+  "pytest-mock==3.12.*",
   "pytest-rerunfailures==13.*",
   "pytest-sugar",
   "pytest-xdist==3.3.*",