[Snyk] Security upgrade jinja2 from 2.7.3 to 3.1.6

[kroman0]

Snyk has created this PR to fix 1 vulnerabilities in the pip dependencies of this project.

Snyk changed the following file(s):

• 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 zope.interface, 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 zope.deprecation, which is not installed.
jinja2 3.1.6 requires MarkupSafe, which is not installed.
Babel 2.14.0 has requirement pytz>=2015.7; python_version < "3.9", but you have pytz 2014.10.

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

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This change is 

[guardrails]

⚠️ We detected 2 security issues in this pull request:

Vulnerable Libraries (2)

Severity	Details
High	pkg:pypi/pygments@2.0.2 (t) upgrade to: 2.7.4
Critical	pkg:pypi/pyyaml@3.11 (t) upgrade to: 5.3.1

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