Remove obsolete members. (#2904)

Author: timcassell

src/BenchmarkDotNet.Annotations/Jobs/RuntimeMoniker.cs

@@ -79,12 +79,6 @@ public enum RuntimeMoniker
         /// </summary>
         NetCoreApp31,
 
-        /// <summary>
-        /// .NET Core 5.0 aka ".NET 5"
-        /// </summary>
-        [Obsolete("Please switch to the 'RuntimeMoniker.Net50'")]
-        NetCoreApp50,
-
         /// <summary>
         /// .NET 5.0
         /// </summary>

src/BenchmarkDotNet.Diagnostics.dotMemory/DotMemoryDiagnoser.cs

@@ -108,9 +108,6 @@ internal override bool IsSupported(RuntimeMoniker runtimeMoniker)
             case RuntimeMoniker.Mono80:
             case RuntimeMoniker.Mono90:
             case RuntimeMoniker.Mono10_0:
-#pragma warning disable CS0618 // Type or member is obsolete
-            case RuntimeMoniker.NetCoreApp50:
-#pragma warning restore CS0618 // Type or member is obsolete
                 return false;
             case RuntimeMoniker.NetCoreApp20:
             case RuntimeMoniker.NetCoreApp21:

src/BenchmarkDotNet.Diagnostics.dotTrace/DotTraceDiagnoser.cs

@@ -111,9 +111,6 @@ internal override bool IsSupported(RuntimeMoniker runtimeMoniker)
             case RuntimeMoniker.Mono80:
             case RuntimeMoniker.Mono90:
             case RuntimeMoniker.Mono10_0:
-#pragma warning disable CS0618 // Type or member is obsolete
-            case RuntimeMoniker.NetCoreApp50:
-#pragma warning restore CS0618 // Type or member is obsolete
                 return false;
             case RuntimeMoniker.NetCoreApp20:
             case RuntimeMoniker.NetCoreApp21: