C#: Turn RuntimeVersion into a record type.

Author: michaelnebel

csharp/extractor/Semmle.Extraction.CSharp.Standalone/Runtime.cs

@@ -22,7 +22,7 @@ internal partial class Runtime
 
         public Runtime(IDotNet dotNet) => this.dotNet = dotNet;
 
-        internal sealed class RuntimeVersion : IComparable<RuntimeVersion>
+        internal record RuntimeVersion : IComparable<RuntimeVersion>
         {
             private readonly string dir;
             private readonly Version version;
@@ -71,11 +71,6 @@ public int CompareTo(RuntimeVersion? other)
                 return c;
             }
 
-            public override bool Equals(object? obj) =>
-                obj is not null && obj is RuntimeVersion other && other.FullPath == FullPath;
-
-            public override int GetHashCode() => FullPath.GetHashCode();
-
             public override string ToString() => FullPath;
         }