Bumping development dependencies versions.

Author: igorborgest

requirements-dev.txt

@@ -1,19 +1,19 @@
 wheel==0.35.1
 awscli>=1.18.0,<2.0.0
-isort==5.4.2
+isort==5.5.1
 black==19.10b0
 pylint==2.6.0
 flake8==3.8.3
 mypy==0.782
-pydocstyle==5.1.0
+pydocstyle==5.1.1
 doc8==0.8.1
-tox==3.19.0
+tox==3.20.0
 pytest==6.0.1
 pytest-cov==2.10.1
 pytest-xdist==2.1.0
 pytest-timeout==1.4.2
 scikit-learn==0.23.2
-cfn-lint==0.35.0
+cfn-lint==0.35.1
 cfn-flip==1.2.3
 twine==3.2.0
 sphinx==3.2.1