Bump dropbox from 1.5.1 to 11.15.0

[dependabot-preview[bot]]

Bumps dropbox from 1.5.1 to 11.15.0.

Release notes

Sourced from dropbox's releases.

v11.15.0

Release Notes:

• Automated Spec Update (#376)

v11.14.0

Release Notes:

• Add Support for Multi-Auth (#371)

v11.13.3

Release Notes:

• 11.13.3 release

• Automated Spec Update (#373)

v11.13.2

Release Notes:

• Automated Spec Update (#372)

v11.13.1

Release Notes:

• Automated Spec Update (#370)

v11.13.0

Release Notes:

• Automated Spec Update (#368)

v11.12.0

Release Notes:

• Automated Spec Update (#366)

v11.11.0

Release Notes:

• Automated Spec Update (#365)

v11.10.0

Release Notes:

• Automated Spec Update (#362)

v11.9.0

Release Notes:

... (truncated)

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