Update to .NET 7

[martincostello]

Update to .NET 7.

Resolves #315.

[codecov[bot]]

Codecov Report

Base: 99.41% // Head: 99.41% // No change to project coverage :thumbsup:

Coverage data is based on head (67c74f5) compared to base (2e3d433). Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #274   +/-   ##
=======================================
  Coverage   99.41%   99.41%           
=======================================
  Files          15       15           
  Lines         340      340           
=======================================
  Hits          338      338           
  Misses          2        2           

Flag	Coverage Δ
linux	98.82% <ø> (-0.59%)	:arrow_down:
macos	99.41% <ø> (ø)
windows	98.82% <ø> (-0.59%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Logging.XUnit/XUnitLoggerOptions.cs	100.00% <ø> (ø)

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