Remove unnecessary unsafe keyword (#58606)

A small cleanup after #56713.

Author: MaximLipnin

src/libraries/System.Console/src/System/ConsolePal.iOS.cs

@@ -22,7 +22,7 @@ public NSLogStream(Encoding encoding) : base(FileAccess.Write)
 
         public override int Read(Span<byte> buffer) => throw Error.GetReadNotSupported();
 
-        public override unsafe void Write(ReadOnlySpan<byte> buffer)
+        public override void Write(ReadOnlySpan<byte> buffer)
         {
             int maxCharCount = _encoding.GetMaxCharCount(buffer.Length);
             char[]? pooledBuffer = null;