[Snyk] Security upgrade tornado from 5.1.1 to 6.3.2

[sendbird-security]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to fix one or more vulnerable packages in the `pip` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • requirements/requirements-python2.7.txt

⚠️ Warning

virtualenv 20.23.0 has requirement importlib-metadata>=6.4.1; python_version < "3.8", but you have importlib-metadata 1.7.0.
virtualenv 20.23.0 has requirement distlib<1,>=0.3.6, but you have distlib 0.3.1.
virtualenv 20.23.0 has requirement filelock<4,>=3.11, but you have filelock 3.0.12.
snowflake-connector-python 2.1.3 has requirement boto3<1.11.0,>=1.4.4, but you have boto3 1.14.25.
snowflake-connector-python 2.1.3 has requirement botocore<1.14.0,>=1.5.0, but you have botocore 1.17.25.
snowflake-connector-python 2.1.3 has requirement requests<2.23.0, but you have requests 2.24.0.
snowflake-connector-python 2.1.3 has requirement cffi<1.14,>=1.9, but you have cffi 1.14.0.
snowflake-connector-python 2.1.3 has requirement cryptography<3.0.0,>=1.8.2, but you have cryptography 3.0.
slackclient 1.3.2 has requirement websocket-client<0.55.0,>=0.35, but you have websocket-client 0.57.0.
pytest-rerunfailures 9.0 has requirement pytest>=5.0, but you have pytest 4.6.11.
pytest-rerunfailures 9.0 has requirement setuptools>=40.0, but you have setuptools 39.0.1.
platformdirs 3.5.1 has requirement typing-extensions>=4.5; python_version < "3.8", but you have typing-extensions 3.7.4.2.
moto 1.3.14 has requirement idna<2.9,>=2.5, but you have idna 2.10.
jupyter-client 5.3.5 requires tornado, which is not installed.
google-auth 1.19.2 has requirement setuptools>=40.3.0, but you have setuptools 39.0.1.
flower 0.9.5 requires tornado, which is not installed.
cfn-lint 0.34.0 has requirement networkx~=2.4; python_version >= "3.5", but you have networkx 2.2.
celery 4.4.6 has requirement kombu<4.7,>=4.6.10, but you have kombu 4.6.3.
botocore 1.17.25 has requirement docutils<0.16,>=0.10, but you have docutils 0.16.

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	556/1000 Why? Recently disclosed, Has a fix available, CVSS 5.4	Open Redirect SNYK-PYTHON-TORNADO-5537286	tornado: 5.1.1 -> 6.3.2	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Some vulnerabilities couldn't be fully fixed and so Snyk will still find them when the project is tested again. This may be because the vulnerability existed within more than one direct dependency, but not all of the affected dependencies could be upgraded.

Check the changes in this PR to ensure they won't cause issues with your project.

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