[Snyk] Fix for 5 vulnerabilities

[snyk-bot]

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

oauth2client 3.0.0 requires rsa, which is not installed.
google-auth 1.22.1 requires rsa, which is not installed.
google-auth 1.22.1 has requirement setuptools>=40.3.0, but you have setuptools 39.0.1.
apache-beam 2.24.0 has requirement httplib2<0.18.0,>=0.8, but you have httplib2 0.19.0.

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	484/1000 Why? Has a fix available, CVSS 5.4	Cross-site Scripting (XSS) SNYK-PYTHON-BLEACH-1069893	bleach: 3.1.5 -> 3.3.0	No	No Known Exploit
	589/1000 Why? Has a fix available, CVSS 7.5	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-HTTPLIB2-1065795	httplib2: 0.17.4 -> 0.19.0	No	No Known Exploit
	554/1000 Why? Has a fix available, CVSS 6.8	CRLF Injection SNYK-PYTHON-HTTPLIB2-569758	httplib2: 0.17.4 -> 0.19.0	No	No Known Exploit
	624/1000 Why? Has a fix available, CVSS 8.2	CRLF Injection SNYK-PYTHON-HTTPLIB2-570767	httplib2: 0.17.4 -> 0.19.0	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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