Bump dropbox from 1.5.1 to 10.4.1#29

Bumps [dropbox](https://github.com/dropbox/dropbox-sdk-python) from 1.5.1 to 10.4.1. <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/dropbox/dropbox-sdk-python/releases">dropbox's releases</a>.</em></p> <blockquote> <h2>v10.4.1</h2> <ul> <li>Fix bug with client copy</li> <li>Fix bug with team client as_user and as_admin</li> <li>Fix Python 3 linter issue</li> <li>Update tox.ini to check python 3.7 and 3.8</li> <li>Update setup.py to support python 3.7 and 3.8</li> <li>Remove stone as submodule and add as dependency</li> <li>Update Spec Files Namespace</li> </ul> <p>Add internal_error to SearchError union. Add locked to LookupError union. Add cant_move_into_vault to RelocationError union. Add MoveIntoVaultError union. Add SearchMatchFieldOptions struct. Add optional match_field_options to SearchV2Arg struct. Doc/example changes. Sharing Namespace</p> <p>Add is_vault to SharePathError union. Add invalid_shared_folder to AddFolderMemberError union. Team Namespace</p> <p>Make members field of LegalHoldsPolicyUpdateArg struct optional. Add app_folder_removal_not_supported to RevokeLinkedAppError union. Doc/example changes. Team Log Namespace</p> <p>Add auto_approve to InviteMethod union. Add moved_from_another_team to InviteMethod union. Add moved_from_another_team to MemberStatus union. Add no_one to SharedLinkVisibility union. Add optional new_team to MemberChangeStatusDetails struct. Add optional previous_team to MemberChangeStatusDetails struct. Add external_sharing_create_report_details to EventDetails union. Add external_sharing_report_failed to EventDetails union. Add content_administration_policy_changed_details to EventDetails Add external_sharing_create_report to EventType. Add external_sharing_report_failed to EventType. Add content_administration_policy_changed to EventType. union. Add send_for_signature_policy_changed_details to EventDetails union. Add external_sharing_create_report to EventTypeArgs union. Add external_sharing_report_failed to EventTypeArgs union. Add content_administration_policy_changed to EventTypeArgs union. Add send_for_signature_policy_changed to EventTypeArgs union. Add SendForSignaturePolicy union. Add ExternalSharingCreateReportDetails struct. Add ExternalSharingReportFailedDetails struct. Add ContentAdministrationPolicyChangedDetails struct.</p> <!-- raw HTML omitted --> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li>See full diff in <a href="https://github.com/dropbox/dropbox-sdk-python/commits/v10.4.1">compare view</a></li> </ul> </details> <br /> [](https://dependabot.com/compatibility-score/?dependency-name=dropbox&package-manager=pip&previous-version=1.5.1&new-version=10.4.1) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. 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