Updated multiple build and test dependencies

[zenmonkeykstop]

Status

Ready for review

Description of Changes

Updates multiple dependencies No securedrop-app-code dependency changes (with the exception of setuptools itsefl) so no diff reviews performed.

• pip 19.3.1 -> 21.1.1
• pip-tools 4.5.1 -> 6.1.0
• setuptools 46.0.0 -> 56.0.0
• setuptools-scm 5.0.2 (no hash check) -> 6.0.1 (w/ hash check)
• pillow 8.1.1 -> 8.2.0

Testing

• CI is green
• No new non-test dependencies introduced.

Deployment

[emkll]

Admin tests are failing when installing the packages:

Requirement already satisfied: pip==21.1.1 in ./.tox/py3/lib/python3.7/site-packages (from -r /opt/admin/requirements-dev.txt (line 238)) (21.1.1)
ERROR: Cannot install setuptools==46.0.0 and setuptools==56.0.0 because these package versions have conflicting dependencies.

The conflict is caused by:
    The user requested setuptools==56.0.0
    The user requested setuptools==46.0.0

This might be due to a discrepancy with setuptools version pinned in admin/requirements-dev.txt

[codecov-commenter]

Codecov Report

Merging #5888 (6219282) into develop (84b7042) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #5888   +/-   ##
========================================
  Coverage    85.37%   85.37%           
========================================
  Files           53       53           
  Lines         3876     3876           
  Branches       480      480           
========================================
  Hits          3309     3309           
  Misses         455      455           
  Partials       112      112           

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[conorsch]

Very nice, thank you for taking the time, @zenmonkeykstop!