build: upgrade to anglesharp 0.16.0

Author: egil

src/AngleSharp.Diffing.Tests/AngleSharp.DiffingTests.csproj

@@ -6,6 +6,7 @@
     <AssemblyName>AngleSharp.Diffing.Tests</AssemblyName>
     <RootNamespace>AngleSharp.Diffing</RootNamespace>
     <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies> <!-- https://github.com/Tyrrrz/GitHubActionsTestLogger/issues/5 -->
+    <Nullable>annotations</Nullable>
   </PropertyGroup>
 
   <ItemGroup>

src/Directory.Build.props

@@ -1,18 +1,18 @@
 <Project>
   <PropertyGroup>
-    <Version>0.15.0</Version>
+    <Version>0.16.0</Version>
   </PropertyGroup>
 
   <PropertyGroup>
-    <LangVersion>8.0</LangVersion>
+    <LangVersion>9.0</LangVersion>
     <Nullable>enable</Nullable>
     <WarningsAsErrors>CS8600;CS8602;CS8603;CS8625</WarningsAsErrors>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>../Key.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AngleSharp" Version="0.15.0" />
-    <PackageReference Include="AngleSharp.Css" Version="0.15.0" />
+    <PackageReference Include="AngleSharp" Version="0.16.0" />
+    <PackageReference Include="AngleSharp.Css" Version="0.16.0" />
   </ItemGroup>
 </Project>