Use dotnet 9 to test all frameworks

Author: laurynas

.github/workflows/main.yml

@@ -6,9 +6,6 @@ jobs:
     strategy:
       matrix:
         dotnet-version:
-          - '6.0'
-          - '7.0'
-          - '8.0'
           - '9.0'
     name: .NET ${{ matrix.dotnet-version }} sample
     steps:

DetectLanguage.Tests/DetectLanguage.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
+    <TargetFrameworks>net9.0</TargetFrameworks>
 
     <IsPackable>false</IsPackable>
   </PropertyGroup>

DetectLanguage/DetectLanguage.csproj

@@ -12,7 +12,7 @@
     <RepositoryUrl>https://github.com/detectlanguage/detectlanguage-dotnet</RepositoryUrl>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageIconUrl>https://www.nuget.org/profiles/detectlanguage/avatar?imageSize=128</PackageIconUrl>
-    <TargetFrameworks>net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
+    <TargetFrameworks>net5.0;net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
     <PackageReadmeFile>README.md</PackageReadmeFile>
   </PropertyGroup>