Bump furo from 2020.12.30b24 to 2021.2.28b28 (#310)

Bumps [furo](https://github.com/pradyunsg/furo) from 2020.12.30b24 to 2021.2.28b28.
- [Release notes](https://github.com/pradyunsg/furo/releases)
- [Changelog](https://github.com/pradyunsg/furo/blob/main/docs/changelog.md)
- [Commits](pradyunsg/furo@2020.12.30.beta24...2021.02.28.beta28)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

poetry.lock

@@ -44,7 +44,7 @@ pep8-naming = "^0.11.1"
 darglint = "^1.7.0"
 reorder-python-imports = "^2.4.0"
 pre-commit-hooks = "^3.4.0"
-furo = "^2020.12.30b24"
+furo = "^2021.2.28b28"
 Pygments = "^2.7.4"
 poetry = "^1.1.5"
 pytest-datadir = "^1.3.1"