Uses new reproducible wheels from our builds

[kushaldas]

The new wheels are coming in the following PR:

freedomofpress/securedrop-builder#213

These wheels are reproducible, you can build them following our
Makefile.

How to test?

They sha256sums should match with the above mentioned PR.

https://github.com/freedomofpress/securedrop-debian-packaging/pull/213/files#diff-7899317ed7333cf6bdab16b9bf5773f780ecb55b11114fc715e9240b16fd76ff

There is a temporary commit, which we can remove before merge.

[conorsch]

Note: The package build will fail as it is dependent of the above PR to be merged.

True, although you can add a "TEMPORARY" commit to this PR that checks out the feature branch on the packaging repo. That will allow you to confirm that CI will pass post-merge of the packaging PR. It'll also help reviewers!

[conorsch]

Manually verified the new checksums match what's shown in freedomofpress/securedrop-builder#213. Approving, but not merging, since there's still a temporary commit that should be removed.

[conorsch]

For reference, the historical CI build showing all tests passing can be found here: https://app.circleci.com/pipelines/github/freedomofpress/securedrop-proxy/24/workflows/9507a3ac-5d10-471c-b2a8-e17b829ee8b6/jobs/370 I've removed the temporary feature branch pin, and will proceed with merge, verifying all tests are passing over in freedomofpress/securedrop-builder#213