Block port 10080

Tests: web-platform-tests/wpt#28445.

Fixes #1191.

Author: annevk

fetch.bs

@@ -2568,6 +2568,7 @@ run these steps:
  <tr><td>6668<td>ircu
  <tr><td>6669<td>ircu
  <tr><td>6697<td>ircs-u
+ <tr><td>10080<td>amanda
 </table>
 <!-- Service names per
      https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.txt -->