[Snyk] Security upgrade urllib3 from 1.24.3 to 1.25.9

[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

requests 2.20.0 has requirement urllib3<1.25,>=1.21.1, but you have urllib3 1.26.3.
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	Issue	Upgrade	Breaking Change	Exploit Maturity
	HTTP Header Injection SNYK-PYTHON-URLLIB3-1014645	urllib3: 1.24.3 -> 1.25.9	No	No Known Exploit

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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