Dropbox

Release Notes:

* Remove the pin for `urllib3` ([507](https://github.com/dropbox/dropbox-sdk-python/pull/507))

Release Notes:

* Fix incorrect pin of `requests` ([505](https://github.com/dropbox/dropbox-sdk-python/pull/505))

Release Notes:
* Fixes to Restore CI ([492](https://github.com/dropbox/dropbox-sdk-python/pull/492), [#501](https://github.com/dropbox/dropbox-sdk-python/pull/501))
* Fixes to doc generation ([500](https://github.com/dropbox/dropbox-sdk-python/pull/500), [#503](https://github.com/dropbox/dropbox-sdk-python/pull/503))
* Manual Spec Update ([498](https://github.com/dropbox/dropbox-sdk-python/pull/498))
* Stop providing a hardcoded CA bundle ([489](https://github.com/dropbox/dropbox-sdk-python/pull/489), [#499](https://github.com/dropbox/dropbox-sdk-python/pull/499))

* Fix invalid specifier in stone requirement (https://github.com/dropbox/dropbox-sdk-python/pull/456)

This is a second attempt, since v11.36.1 didn't quite work right.

* Fix invalid specifier in stone requirement (456)

Release Notes:

* Automated Spec Update ([452](https://github.com/dropbox/dropbox-sdk-python/pull/452))