Use src-layout.

[methane]

Fixes #599

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (abb139b) 86.48% compared to head (757ae1e) 86.48%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #600   +/-   ##
=======================================
  Coverage   86.48%   86.48%           
=======================================
  Files           7        7           
  Lines         555      555           
=======================================
  Hits          480      480           
  Misses         75       75           

Impacted Files	Coverage Δ
src/MySQLdb/__init__.py	86.84% <ø> (ø)
src/MySQLdb/_exceptions.py	100.00% <ø> (ø)
src/MySQLdb/connections.py	87.40% <ø> (ø)
src/MySQLdb/converters.py	82.35% <ø> (ø)
src/MySQLdb/cursors.py	81.17% <ø> (ø)
src/MySQLdb/release.py	100.00% <ø> (ø)
src/MySQLdb/times.py	100.00% <ø> (ø)

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