[Snyk] Fix for 2 vulnerabilities

[digitake]

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.txt

⚠️ Warning

google-gax 0.16.0 has requirement protobuf<4.0dev,>=3.0.0, but you have protobuf 4.0.0rc2.
google-auth 1.24.0 has requirement setuptools>=40.3.0, but you have setuptools 39.0.1.
gax-google-pubsub-v1 0.8.3 has requirement google-gax<0.13.0,>=0.12.5, but you have google-gax 0.16.0.
gax-google-logging-v2 0.8.3 has requirement google-gax<0.13.0,>=0.12.5, but you have google-gax 0.16.0.

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	704/1000 Why? Has a fix available, CVSS 9.8	Information Exposure SNYK-PYTHON-REQUESTS-72435	requests: 2.11.1 -> 2.20	No	No Known Exploit
	589/1000 Why? Has a fix available, CVSS 7.5	Timing Attack SNYK-PYTHON-RSA-1038401	rsa: 4.5 -> 4.7	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 effected dependencies could be upgraded.

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

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