Fix runtime exception

The OverflowException here depends on the amount of memory the EVE Online client is using. (Bots use this method for the first memory reading per game client process.)

As reported by dotpixel and Praevalidus at Viir/bots#4

implement/read-memory-64-bit/Program.cs

@@ -414,7 +414,7 @@ void logLine(string lineText)
 
             } while (true);
 
-            logLine($"Found {committedRegions.Count} committed regions with a total size of {committedRegions.Select(region => region.content.Length).Sum()}.");
+            logLine($"Found {committedRegions.Count} committed regions with a total size of {committedRegions.Select(region => (long)region.content.Length).Sum()}.");
 
             return (committedRegions.ToImmutableList(), logEntries.ToImmutableList());
         }