Update target framework from net7 to net8.

Author: Konard

csharp/Platform.Reflection/Platform.Reflection.csproj

@@ -23,9 +23,7 @@
     <IncludeSymbols>true</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
     <LangVersion>latest</LangVersion>
-    <PackageReleaseNotes>Target frameworks are changed to net8.
-License is changed to Unlicense.
-Platform.Collections dependency is updated from 0.3.2 to 0.4.0.</PackageReleaseNotes>
+    <PackageReleaseNotes>Update target framework from net7 to net8.</PackageReleaseNotes>
     <Nullable>enable</Nullable>
   </PropertyGroup>