Create new release for the 5-Safes RO-Crate profile

[douglowe]

We have an issue importing the tagged release into our crate validation service - see notes in eScienceLab/RO-Crate-Validation-Service#136

A new release with the current stable version of this profile is needed

[douglowe]

Completed with release https://github.com/eScienceLab/rocrate-validator/releases/tag/five-safes-0.7.4-beta