updates submodule & fixes content benchmarks & sets up ci (#11851)

Content.Benchmarks/NetSerializerStringBenchmark.cs

@@ -7,13 +7,15 @@ using System.Text.Unicode;
 using BenchmarkDotNet.Attributes;
 using Lidgren.Network;
 using NetSerializer;
+using Robust.Shared.Analyzers;
 
 namespace Content.Benchmarks
 {
     // Code for the *Slow and *Unsafe implementations taken from NetSerializer, licensed under the MIT license.
 
     [MemoryDiagnoser]
-    public sealed class NetSerializerStringBenchmark
+    [Virtual]
+    public class NetSerializerStringBenchmark
     {
         private const int StringByteBufferLength = 256;
         private const int StringCharBufferLength = 128;