Bump pytest-mock from 3.1.0 to 3.6.1 in /compilesketches

Bumps [pytest-mock](https://github.com/pytest-dev/pytest-mock) from 3.1.0 to 3.6.1.
- [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@v3.1.0...v3.6.1)

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

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

Author: dependabot[bot]

compilesketches/tests/requirements.txt

@@ -1,4 +1,4 @@
 --requirement ../requirements.txt
 coverage==5.2.1
 pytest==5.4.2
-pytest-mock==3.1.0
+pytest-mock==3.6.1