build(deps): bump dropbox from 11.36.2 to 12.0.0

[dependabot[bot]]

Bumps dropbox from 11.36.2 to 12.0.0.

Release notes

Sourced from dropbox's releases.

v12.0.0

Release Notes:

• Fixes to Restore CI (#492, #501)
• Fixes to doc generation (#500, #503)
• Manual Spec Update (#498)
• Stop providing a hardcoded CA bundle (#489, #499)

Commits

• 0faa204 12.0.0 release
• 1d379b4 Further fixes to doc generation (#503)
• 52893f0 Fix doc generation and PyPI uploads by pinning to Python 3.7 (#500)
• 3173f6e Remove CI for Python 3.5 (#501)
• e2b0ca8 Prepare Release Notes for v12 (#499)
• 5c6809d Manual Spec Update (#498)
• 41e4b00 Stop providing a hardcoded CA bundle (#489)
• 75596da Restore CI, including Python 2.7 (#492)
• See full diff in compare view

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[dependabot[bot]]

Superseded by #12321.