[Snyk] Security upgrade sphinx from 1.3.1 to 3.3.0

[kroman0]

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.txt

⚠️ Warning

python-coveralls 2.5.0 requires coverage, which is not installed.
python-coveralls 2.5.0 requires sh, which is not installed.
pyramid 1.5.7 requires repoze.lru, which is not installed.
pyramid 1.5.7 requires venusian, which is not installed.
pyramid 1.5.7 requires WebOb, which is not installed.
pyramid 1.5.7 requires zope.interface, which is not installed.
pyramid 1.5.7 requires zope.deprecation, which is not installed.
Jinja2 2.7.3 requires markupsafe, which is not installed.
Babel 2.12.1 has requirement pytz>=2015.7; python_version < "3.9", but you have pytz 2014.10.

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	658/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-SPHINX-5811865	sphinx: 1.3.1 -> 3.3.0	No	Proof of Concept

(*) 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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🦉 Regular Expression Denial of Service (ReDoS)

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This change is 

[guardrails]

⚠️ We detected 3 security issues in this pull request:

Vulnerable Libraries (3)

Severity	Details
High	pkg:pypi/jinja2@2.7.3 (t) upgrade to: 2.10.1
Critical	pkg:pypi/pygments@2.0.2 (t) upgrade to: 2.1,2.1
N/A	pkg:pypi/pyyaml@3.11 (t) upgrade to: 5.1

More info on how to fix Vulnerable Libraries in Python.

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