[Snyk] Security upgrade lxml from 4.6.2 to 4.6.3

[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:
  • {{cookiecutter.project_slug}}/requirements.txt

⚠️ Warning

wagtail 2.10.2 requires tablib, which is not installed.
wagtail 2.10.2 requires django-taggit, which is not installed.
wagtail 2.10.2 requires django-modelcluster, which is not installed.
wagtail 2.10.2 requires django-filter, which is not installed.
wagtail 2.10.2 requires djangorestframework, which is not installed.
wagtail 2.10.2 has requirement Django<3.2,>=2.2, but you have Django 1.11.29.
pytest-sugar 0.9.4 requires pytest, which is not installed.
pytest-logger 0.5.1 requires pytest, which is not installed.
pytest-forked 1.3.0 requires pytest, which is not installed.
pytest-factoryboy 2.0.3 requires pytest, which is not installed.
pytest-cov 2.10.1 requires pytest, which is not installed.
pip-tools 5.5.0 has requirement pip>=20.1, but you have pip 9.0.3.
doc8 0.8.1 requires stevedore, which is not installed.
doc8 0.8.1 requires Pygments, which is not installed.
django-nexmo 2.0.0a1 requires nexmo, which is not installed.
beautifulsoup4 4.8.2 requires soupsieve, which is not installed.

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	601/1000 Why? Recently disclosed, Has a fix available, CVSS 6.3	Cross-site Scripting (XSS) SNYK-PYTHON-LXML-1088006	lxml: 4.6.2 -> 4.6.3	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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