Blacken code base

[scaramallion]

Reference issue

The issue describing the bug or feature that this PR addresses.

Tasks

• Fix or feature added

[scaramallion]

My empty lines, my precious antique empty lines!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.87%. Comparing base (4615d4d) to head (e0c74e3).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1073   +/-   ##
=======================================
  Coverage   99.87%   99.87%           
=======================================
  Files          28       28           
  Lines        9012     9012           
=======================================
  Hits         9001     9001           
  Misses         11       11           

Files with missing lines	Coverage Δ
pynetdicom/__init__.py	100.00% <ø> (ø)
pynetdicom/__main__.py	0.00% <ø> (ø)
pynetdicom/_config.py	100.00% <ø> (ø)
pynetdicom/_globals.py	100.00% <ø> (ø)
pynetdicom/_validators.py	100.00% <ø> (ø)
pynetdicom/_version.py	100.00% <ø> (ø)
pynetdicom/acse.py	100.00% <100.00%> (ø)
pynetdicom/ae.py	100.00% <ø> (ø)
pynetdicom/association.py	100.00% <100.00%> (ø)
pynetdicom/dimse_primitives.py	100.00% <ø> (ø)
... and 5 more

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