Update target framework from net7 to net8.

Author: Konard

csharp/Platform.Protocols.Lino.Tests/Platform.Protocols.Lino.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net7;net8</TargetFrameworks>
+    <TargetFramework>net8</TargetFramework>
     <IsPackable>false</IsPackable>
     <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>

csharp/Platform.Protocols.Lino/Platform.Protocols.Lino.csproj

@@ -6,7 +6,7 @@
     <AssemblyTitle>Platform.Protocols.Lino</AssemblyTitle>
     <VersionPrefix>0.4.5</VersionPrefix>
     <Authors>Konstantin Diachenko</Authors>
-    <TargetFrameworks>net7;net8</TargetFrameworks>
+    <TargetFramework>net8</TargetFramework>
     <PackageId>Platform.Protocols.Lino</PackageId>
     <PackageTags>LinksPlatform;Protocols.Lino;Lino;IListExtensions;Link;Parser</PackageTags>
     <PackageIconUrl>https://raw.githubusercontent.com/linksplatform/Documentation/18469f4d033ee9a5b7b84caab9c585acab2ac519/doc/Avatar-rainbow-icon-64x64.png</PackageIconUrl>
@@ -22,7 +22,7 @@
     <IncludeSymbols>true</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
     <LangVersion>latest</LangVersion>
-    <PackageReleaseNotes>Add support for (:) expression.</PackageReleaseNotes>
+    <PackageReleaseNotes>Update target framework from net7 to net8.</PackageReleaseNotes>
     <Nullable>enable</Nullable>
     <RootNamespace>Platform.Protocols.Lino</RootNamespace>
   </PropertyGroup>