Replaced StringBuffer with StringBuilder in NetstatCommand. Tests pass. (#539)

Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com>
Co-authored-by: LSantha <LSantha@users.noreply.github.com>
Co-authored-by: Levente Santha <levente@adobe.com>

Author: opencode-agent[bot]

cli/src/commands/org/jnode/command/net/NetstatCommand.java

@@ -76,7 +76,7 @@ private void showStats(PrintWriter out, Statistics stat, int padSize)
             padOutput(out, padSize);
             out.print(str_none);
         } else {
-            StringBuffer buffer = new StringBuffer();
+            StringBuilder buffer = new StringBuilder();
             for (Statistic statistic : statistics) {
                 buffer.append(paddedString(padSize)).append(statistic.getName()).append(' ')
                     .append(statistic.getValue()).append("\n");