Update CI test versions and dev deps

[rowanseymour]

No description provided.

[codecov-commenter]

Codecov Report

Merging #175 (400be20) into main (de075ed) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #175   +/-   ##
=======================================
  Coverage   81.72%   81.72%           
=======================================
  Files          33       33           
  Lines        2222     2222           
=======================================
  Hits         1816     1816           
  Misses        406      406           

Files Changed	Coverage Δ
smartmin/csv_imports/migrations/0001_initial.py	100.00% <ø> (ø)
.../csv_imports/migrations/0002_auto_20161118_1920.py	100.00% <ø> (ø)
..._imports/migrations/0003_importtask_task_status.py	100.00% <ø> (ø)
.../csv_imports/migrations/0004_auto_20170223_0917.py	100.00% <ø> (ø)
...tions/0005_alter_importtask_created_by_and_more.py	100.00% <ø> (ø)
smartmin/csv_imports/models.py	90.90% <ø> (ø)
smartmin/pdf.py	0.00% <ø> (ø)
smartmin/users/migrations/0001_initial.py	100.00% <ø> (ø)
...tmin/users/migrations/0002_remove_failed_logins.py	100.00% <ø> (ø)
...artmin/users/migrations/0003_auto_20210219_1548.py	100.00% <ø> (ø)
... and 4 more

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