Update pytest requirement from ~=6.2 to ~=7.0 in /_common (#121)

Updates the requirements on [pytest](https://github.com/pytest-dev/pytest) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@6.2.0...7.0.0)

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

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

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

_common/requirements-test.txt

@@ -4,7 +4,7 @@ cov-core~=1.15
 coverage~=6.3
 flake8~=4.0
 mock~=4.0
-pytest~=6.2
+pytest~=7.0
 pytest-cov~=3.0
 pytest-gitignore~=1.3
 pytest-mock~=3.7