Ignore safety ID 44715 + add numpy dependency

[CasperWA]

Description:

Fixes #359
Fixes #360

Add NumPy as an explicit dependency to be able to have version control.
Set the minimum version of NumPy to the latest supported version for Python 3.6+ (v1.19).

Ignore safety ID 44715 in CI.

Type of change:

• Bug fix.
• New feature.
• Documentation update.

Checklist:

This checklist can be used as a help for the reviewer.

• Is the code easy to read and understand?
• Are comments for humans to read, not computers to disregard?
• Does a new feature has an accompanying new test (in the CI or unit testing schemes)?
• Has the documentation been updated as necessary?
• Does this close the issue?
• Is the change limited to the issue?
• Are errors handled for all outcomes?
• Does the new feature provide new restrictions on dependencies, and if so is this documented?

Comments:

[CasperWA]

To be able to accommodate these safety issues, one will need to require minimum Python 3.8 - which is a bit drastic in my opinion. I suggest to ignore these particular safety issues as well, since it is suggested by the NumPy developers in the issue referenced in #360 that these CVEs are not as crucial as safety makes it out to be.

[jesper-friis]

Agree with your judgement