Bump gunicorn from 20.0.4 to 20.1.0

[dependabot-preview[bot]]

Bumps gunicorn from 20.0.4 to 20.1.0.

Commits

• 61ccfd6 bump to 20.1.0
• d1f0f11 fix inline code syntax in news
• f87882e add an empty line in news.rst
• 7a79808 update changeslog
• 6fd97b9 Document that WEB_CONCURRENCY is set by, at least, Heroku
• dad99a1 Update gunicorn_ext.py
• 3273492 Improve settings documentation
• 86eac4c Merge pull request #2479 from benoitc/capture-peer-name
• 03c642e Merge pull request #2480 from kofrezo/update_docs_install
• a4407ab Default to Python 3 version of gunicorn in Stretch
• Additional commits viewable in compare view

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