Resolve multiple deprecation warnings relating to BSImagePicker

[allanlang]

We have multiple deprecation warnings in our build logs such as the following:

/Users/runner/Library/Developer/Xcode/DerivedData/Tree_Tracker-biwqhorsnxugqmeoimetbejdpnea/SourcePackages/checkouts/BSImagePicker/Sources/Scene/Albums/AlbumsViewController.swift:26:40: using 'class' keyword to define a class-constrained protocol is deprecated; use 'AnyObject' instead

Resolve these to avoid obsolescence, replacing this dependency if necessary.