Upgrade docopt_ng

[lemenkov]

Upgrade docopt to ver. 0.9.0 to restore compatibility with Python 3.11. See jazzband/docopt-ng#49 for further details.

What I did

Related issue: jazzband/docopt-ng#49

How I did it

Just tried to use Brownie with Python 3.11

How to verify it

Try to run Brownie with a few commanfd-line switches with Python 3.11

Checklist

• [ ] I have confirmed that my PR passes all linting checks
• [ ] I have included test cases
• [ ] I have updated the documentation
• [x] I have added an entry to the changelog

[iamdefinitelyahuman]

Closing this for now, will dump all dependencies in the upcoming release