[TASK] Remove famfamfam/silk note

We finally removed remaining usages with #101647
and can thus drop the info in about module. The
domain is offline meanwhile, so we backport to
v12 to avoid dead links in the backend.

Resolves: #101823
Related: #101647
Releases: main, 12.4
Change-Id: Id925da8a2dc87ca840d65b750f5025ae00fee7f0
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80818


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>

typo3/sysext/backend/Resources/Private/Partials/About/ExternalLibraries.html

@@ -149,10 +149,6 @@
                 <td>Muuri</td>
                 <td><a href="https://haltu.github.io/muuri/" target="_blank" rel="noreferrer">haltu.github.io</a></td>
             </tr>
-            <tr>
-                <td>FAMFAMFAM Silk Icons</td>
-                <td><a href="http://famfamfam.com/lab/icons/silk/" target="_blank" rel="noreferrer">famfamfam.com</a></td>
-            </tr>
         </table>
     </div>
 </div>