Update src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray_1.Builder.cs

Co-authored-by: Eirik Tsarpalis <[email protected]>

Author: stephentoub

src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray_1.Builder.cs

@@ -1097,7 +1097,7 @@ private void RemoveAtRange(ICollection<int> indicesToRemove)
             }
 
             /// <summary>Gets a <see cref="Memory{T}"/> for the filled portion of the backing array.</summary>
-            internal Memory<T> AsMemory() => new Memory<T>(_elements, 0, _count);
+            internal Memory<T> AsMemory() => new(_elements, 0, _count);
         }
     }
 }