Bump pip-tools from 6.4.0 to 6.6.2

Bumps [pip-tools](https://github.com/jazzband/pip-tools) from 6.4.0 to 6.6.2.
- [Release notes](https://github.com/jazzband/pip-tools/releases)
- [Changelog](https://github.com/jazzband/pip-tools/blob/master/CHANGELOG.md)
- [Commits](jazzband/pip-tools@6.4.0...6.6.2)

---
updated-dependencies:
- dependency-name: pip-tools
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

setup.py

@@ -48,7 +48,7 @@
             "mock==2.0.0",
             "virtualenv==20.13.0",
             "flake8==4.0.1",
-            "pip-tools==6.4.0",
+            "pip-tools==6.6.2",
         ],
     },
     classifiers=[