Update to .NET 6

[khellang]

Just a few minor changes 😅

[codecov]

Codecov Report

Merging #8 (7e8f6f9) into master (6dd91e6) will increase coverage by 0.03%.
The diff coverage is 92.45%.

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
+ Coverage   89.91%   89.94%   +0.03%     
==========================================
  Files          16       16              
  Lines         347      358      +11     
==========================================
+ Hits          312      322      +10     
- Misses         35       36       +1     

Impacted Files	Coverage Δ
...slators/Internal/SqliteNodaTimeMemberTranslator.cs	89.58% <33.33%> (-3.75%)	⬇️
...ors/Internal/SqliteNodaTimeMethodCallTranslator.cs	95.65% <94.44%> (+0.14%)	⬆️
...sions/SqliteNodaTimeServiceCollectionExtensions.cs	81.81% <100.00%> (-1.52%)	⬇️
EFCore.Sqlite.NodaTime/Extensions/Utilities.cs	83.33% <100.00%> (ø)
...ructure/Internal/SqliteNodaTimeOptionsExtension.cs	65.21% <100.00%> (+1.58%)	⬆️
...ding/Internal/SqliteNodaTimeCodeGeneratorPlugin.cs	100.00% <100.00%> (+100.00%)	⬆️

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