housekeeping: Update Copyright Year

[worldbeater]

What kind of change does this PR introduce?

This updates copyright year in the headers of the files. Based on reactiveui/ReactiveUI#2677 (comment)

[codecov]

Codecov Report

Merging #676 (68938df) into main (ad8493f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #676   +/-   ##
=======================================
  Coverage   71.84%   71.84%           
=======================================
  Files          99       99           
  Lines        4717     4717           
=======================================
  Hits         3389     3389           
  Misses       1328     1328           

Impacted Files	Coverage Δ
....AppCenter/AppCenterFeatureUsageTrackingSession.cs	82.14% <ø> (ø)
src/Splat.AppCenter/AppCenterViewTracking.cs	0.00% <ø> (ø)
.../ApplicationInsightsFeatureUsageTrackingSession.cs	82.35% <ø> (ø)
...icationInsights/ApplicationInsightsViewTracking.cs	30.00% <ø> (ø)
src/Splat.Autofac/AutofacDependencyResolver.cs	76.05% <ø> (ø)
src/Splat.Autofac/SplatAutofacExtensions.cs	100.00% <ø> (ø)
src/Splat.Common.Test/ViewOne.cs	0.00% <ø> (ø)
src/Splat.Common.Test/ViewTwo.cs	0.00% <ø> (ø)
src/Splat.Drawing/Bitmaps/BitmapLoader.cs	0.00% <ø> (ø)
src/Splat.Drawing/Bitmaps/BitmapLoaderException.cs	0.00% <ø> (ø)
... and 88 more

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[github-actions]

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