Update development tooling

[jodal]

• CI: Add Python 3.11 to test matrix
• black: Target Python 3.7-3.11
• Move docs dependencies into pyproject.toml
• Setup envrc and asdf to manage Python versions

Upgrade:

• black
• flake8 plugins
• httpx
• isort
• nox
• poetry
• pytest
• sphinx-rtd-theme

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (d9b364f) compared to base (75ee100).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #163   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines          874       874           
  Branches       122       139   +17     
=========================================
  Hits           874       874           

Impacted Files	Coverage Δ
src/biip/gtin/_enums.py	100.00% <100.00%> (ø)

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