fix(deps): update dependency dropbox to v12

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
dropbox (source)	^11.36.0 -> ^12.0.0

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Release Notes

dropbox/dropbox-sdk-python (dropbox)

### [`v12.0.0`](https://togithub.com/dropbox/dropbox-sdk-python/releases/tag/v12.0.0) [Compare Source](https://togithub.com/dropbox/dropbox-sdk-python/compare/v11.36.2...v12.0.0) Release Notes: - Fixes to Restore CI ([#​492](https://togithub.com/dropbox/dropbox-sdk-python/pull/492), [#​501](https://togithub.com/dropbox/dropbox-sdk-python/pull/501)) - Fixes to doc generation ([#​500](https://togithub.com/dropbox/dropbox-sdk-python/pull/500), [#​503](https://togithub.com/dropbox/dropbox-sdk-python/pull/503)) - Manual Spec Update ([#​498](https://togithub.com/dropbox/dropbox-sdk-python/pull/498)) - Stop providing a hardcoded CA bundle ([#​489](https://togithub.com/dropbox/dropbox-sdk-python/pull/489), [#​499](https://togithub.com/dropbox/dropbox-sdk-python/pull/499))

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