Update mypy

[phy1729]

Mypy changed the default for the implicit_optional setting, so I included that in this PR as well. Error codes are shown by default now and the ollow_imports = 'silent' setting is no longer required for mypy to pass.

[codecov[bot]]

Codecov Report

Merging #403 (9799c7c) into main (9109c2e) will decrease coverage by 0.20%. The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #403      +/-   ##
==========================================
- Coverage   98.66%   98.47%   -0.20%     
==========================================
  Files          11       11              
  Lines        1052     1052              
  Branches      199      199              
==========================================
- Hits         1038     1036       -2     
- Misses          6        7       +1     
- Partials        8        9       +1     

Impacted Files	Coverage Δ
arq/connections.py	95.20% <ø> (ø)
arq/jobs.py	98.15% <ø> (ø)
arq/worker.py	99.16% <ø> (ø)

... and 1 file with indirect coverage changes

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[samuelcolvin]

Thanks so much for the contribution, this is replaced by https://github.com/samuelcolvin/arq/pull/439 where I've fixed lots of related things.