Upgrade pytest dependency to more modern version  #138

I have a current issue where a project I'm trying to deploy in a function has a valid dependency requirement for a more recent version range of pytest which is not compatible with the pinned version in fdk-python (pytest@5.4.3). The current pytest release is 7.3.1.

If I understand correctly pytest is also not a core dependency for fdk-python but supports the unit tests capability.

1. Can pytest version be safely upgraded in the project to something more modern?
2. Can pytest be a development dependency and not a required dependency since it's really not a "production" release requirement of a function.