Bump flake8-quotes from 3.2.0 to 3.3.0 in /ngraph/python

Bumps [flake8-quotes](https://github.com/zheller/flake8-quotes) from 3.2.0 to 3.3.0.
- [Release notes](https://github.com/zheller/flake8-quotes/releases)
- [Commits](zheller/flake8-quotes@3.2.0...3.3.0)

---
updated-dependencies:
- dependency-name: flake8-quotes
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

ngraph/python/requirements_test.txt

@@ -2,7 +2,7 @@ flake8==3.9.2
 flake8-bugbear==21.4.3
 flake8-comprehensions==3.3.0
 flake8-docstrings==1.6.0
-flake8-quotes==3.2.0
+flake8-quotes==3.3.0
 mypy==0.812
 onnx==1.8.1
 pydocstyle==5.1.1