Update pytest-mock requirement from ==3.15.* to ==3.16.* (#6628)

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/v3.15.0...v3.16.0)

---
updated-dependencies:
- dependency-name: pytest-mock
  dependency-version: 3.16.0
  dependency-type: direct:development
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pyproject.toml

@@ -122,7 +122,7 @@ dev = [
   "pytest-cache",
   "pytest-cov",
   "pytest-django==4.*",
-  "pytest-mock==3.15.*",
+  "pytest-mock==3.16.*",
   "pytest-sugar",
   "pytest-xdist==3.8.*",
   "pytest-playwright",