Update pdoc3 requirement from ~=0.9.0 to ~=0.9.1 (#126)

Updates the requirements on [pdoc3](https://github.com/pdoc3/pdoc) to permit the latest version.
- [Release notes](https://github.com/pdoc3/pdoc/releases)
- [Changelog](https://github.com/pdoc3/pdoc/blob/master/CHANGELOG)
- [Commits](pdoc3/pdoc@0.9.0...0.9.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

requirements-dev.txt

@@ -1,4 +1,4 @@
 coveralls~=2.1.2
 doctr~=1.8.0
-pdoc3~=0.9.0
+pdoc3~=0.9.1
 responses~=0.11.0