Update dev dependencies

[duckontheweb]

• Bumps versions of black, codespell, nbsphinx, jinja2

  Bumping nbpshinx to 0.8.6 fixes Jinja2 update to version 3 breaks nbsphinx spatialaudio/nbsphinx#563, which was the reason we had pinned jinja2 to <3.0 in the first place.

• Drops pylint and sphinx-autobuild

  pylint seemed like it was added as a dependency early on, but isn't actually used anymore. sphinx-autobuild is not used in our tests, linting, or doc builds, so it seems more appropriate for individual developers to install it themselves if it's part of their personal workflow.

Supersedes #423, #421, #415, #414, and #413

UPDATE 2021-06-10:

• Bumps versions of ipython, flake8
• Also supersedes Update flake8 requirement from ==3.8.* to ==3.9.* #428, Bump ipython from 7.16.1 to 7.24.1 #427, and Bump nbsphinx from 0.7.1 to 0.8.6 #426

UPDATE 2021-06-11

• Bumps mypy and codespell again
• Also supersedes Bump codespell from 1.17.1 to 2.1.0 #436 and Bump mypy from 0.901 to 0.902 #435

PR Checklist:

• Code is formatted (run scripts/format)
• Tests pass (run scripts/test)
• This PR maintains or improves overall codebase code coverage.
• Changes are added to the CHANGELOG. See the docs for information about adding to the changelog.