Remove System.Text.Encodings.Web (#2361)

Microsoft.AspNetCore.WebUtilities 2.2.0 depends on STEW 4.5.0, which is marked
as vulnerable.
STEW was bumped to 6.0.0 in #2016.
Microsoft.AspNetCore.WebUtilities was removed in #2324.

Author: jnyrup

lib/PuppeteerSharp/PuppeteerSharp.csproj

@@ -47,7 +47,6 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="System.Text.Encodings.Web" Version="6.0.0" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.CodeStyle" Version="4.3.1">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>