Update pdoc3 requirement from ~=0.6.3 to ~=0.7.0

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@0.6.3...0.7.0)

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

requirements-dev.txt

@@ -1,4 +1,4 @@
 coveralls~=1.8.2
 doctr~=1.8.0
-pdoc3~=0.6.3
+pdoc3~=0.7.0
 responses~=0.10.6