Remove net7.0

[martincostello]

Remove net7.0 target from test project.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.25%. Comparing base (2e43fdc) to head (3e28678).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #658   +/-   ##
=======================================
  Coverage   98.25%   98.25%           
=======================================
  Files           8        8           
  Lines         287      287           
  Branches       30       30           
=======================================
  Hits          282      282           
  Misses          1        1           
  Partials        4        4           

Flag	Coverage Δ
linux	97.56% <ø> (ø)
macos	97.56% <ø> (ø)
windows	98.25% <ø> (ø)

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