Bump tox from 3.16.0 to 3.16.1

Bumps [tox](https://github.com/tox-dev/tox) from 3.16.0 to 3.16.1.
- [Release notes](https://github.com/tox-dev/tox/releases)
- [Changelog](https://github.com/tox-dev/tox/blob/master/docs/changelog.rst)
- [Commits](tox-dev/tox@3.16.0...3.16.1)

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

Author: dependabot-preview[bot]

requirements/dev.txt

@@ -48,7 +48,7 @@ sphinxcontrib-log-cabinet==1.0.1  # via -r requirements/docs.in
 sphinxcontrib-qthelp==1.0.3  # via sphinx
 sphinxcontrib-serializinghtml==1.1.4  # via sphinx
 toml==0.10.1              # via pre-commit, tox
-tox==3.16.0               # via -r requirements/dev.in
+tox==3.16.1               # via -r requirements/dev.in
 urllib3==1.25.9           # via requests
 virtualenv==20.0.21       # via pre-commit, tox
 wcwidth==0.1.9            # via pytest