Remove redundant target frameworks (#842)

Author: Tyrrrz

YoutubeExplode.Converter/YoutubeExplode.Converter.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net461;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net9.0</TargetFrameworks>
     <IsPackable>true</IsPackable>
     <IsTrimmable Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net6.0'))">true</IsTrimmable>
     <IsAotCompatible Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net7.0'))">true</IsAotCompatible>

YoutubeExplode/YoutubeExplode.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net461;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;net9.0</TargetFrameworks>
     <IsPackable>true</IsPackable>
     <IsTrimmable Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net6.0'))">true</IsTrimmable>
     <IsAotCompatible Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net7.0'))">true</IsAotCompatible>
@@ -21,12 +21,11 @@
     <PackageReference Include="CSharpier.MsBuild" Version="0.29.2" PrivateAssets="all" />
     <PackageReference Include="Deorcify" Version="1.1.0" PrivateAssets="all" />
     <PackageReference Include="Lazy.Fody" Version="1.11.0" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="9.0.0" Condition="'$(TargetFramework)' == 'netstandard2.0' OR '$(TargetFramework)' == 'net461'" />
+    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="9.0.0" Condition="'$(TargetFramework)' == 'netstandard2.0'" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="all" />
     <PackageReference Include="PolyShim" Version="1.14.0" PrivateAssets="all" />
-    <PackageReference Include="System.Memory" Version="4.6.0" Condition="'$(TargetFramework)' == 'netstandard2.0' OR '$(TargetFramework)' == 'net461'" />
-    <PackageReference Include="System.Text.Json" Version="9.0.0" Condition="'$(TargetFramework)' == 'netstandard2.0' OR '$(TargetFramework)' == 'netstandard2.1' OR '$(TargetFramework)' == 'net461'" />
-    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.6.0" Condition="'$(TargetFramework)' == 'netstandard2.0' OR '$(TargetFramework)' == 'net461'" />
+    <PackageReference Include="System.Text.Json" Version="9.0.0" Condition="'$(TargetFramework)' == 'netstandard2.0'" />
+    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.6.0" Condition="'$(TargetFramework)' == 'netstandard2.0'" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework'">