Remove ActiveFedora 11.5.2 guard
Remove ActiveFedora 11.5.2 guard

This guard artificially breaks Hyrax for explictly supported `ActiveFedora`
versions. When `ActiveFedora` 11.5.3 was released recently, this started hitting
us when `bundle update` runs.

samvera/hyrax,samvera/hyrax,samvera/hyrax,samvera/hyrax