Remove unused dependencies from requirements.txt

[dbast]

This removes numpy and six from requirements.txt as there are no left references in the code and moves numpy to the requirements-raspi.txt file as it is a transitive picamera dependency.

Description

Describe the change simply. Provide a reason for the change.

Include screenshots of any new or modified screens (or at least explain why they were omitted)

This pull request is categorized as a:

• New feature
• Bug fix
• Code refactor
• Documentation
• Other

Checklist

• I’ve run pytest and made sure all unit tests pass before sumbitting the PR

If you modified or added functionality/workflow, did you add new unit tests?

• No, I’m a fool
• Yes
• N/A

I have tested this PR on the following platforms/os:

• Raspberry Pi OS Manual Build
• SeedSigner OS on a Pi0/Pi0W board
• Other

Note: Keep your changes limited in scope; if you uncover other issues or improvements along the way, ideally submit those as a separate PR. The more complicated the PR the harder to review, test, and merge.

[jdlcdl]

I recall that while numpy is not used directly in seedsigner, it was still needed as a dependency for picamera. That leaving numpy in requirements.txt ensured this dependency gets built.

[dbast]

should numpy then move to requirements-raspi.txt (where also picamera is referenced)?

[jdlcdl]

Yes @dbast,

I believe that you are correct.

My recollection of trying to remove numpy from requirements was from
#368
...and at that point in time, we had not yet separated requirements.txt into two versions.

Ideally, I think that installing picamera should require numpy as a dependency, but as long as we're requiring it in our own (maybe with a comment), then requirements-raspi.txt seems best.

@kdmukai and @newtonick, do you foresee any problems with that?

UPDATED: I've successfully run the test-suite w/o errors:

• on debian w/o numpy in requirements.txt
• on rpi0 manual-installation at release0.7.0 w/ numpy in requirements-raspi.txt (both for old 1.21 and new 1.25 numpy)
  ...and the app starts up, video working, this works for me.

[dbast]

Moved numpy to requirements-raspi.txt :)

[newtonick]

LGTM but I want to do a full build test before merging.

[newtonick]

Tested