docs: Update third-party dependencies

resources/share/legal/3rdparty.html

@@ -17,9 +17,7 @@
 		<li><a href="#crashpad">Crashpad</a></li>
 		<li><a href="#libxplanemp">libxplanemp</a></li>
 		<li><a href="#opus">Opus</a></li>
-		<li><a href="#qt">Qt5</a></li>
-		<li><a href="#vatlib">vatlib</a></li>
-		<li><a href="#qtwebapp">QtWebApp</a></li>
+		<li><a href="#qt">Qt6</a></li>
 	</ul>
 	<h2 id="boost">Boost</h2>
 	<table>
@@ -546,35 +544,5 @@ If the Library as you received it specifies that a proxy can decide
 whether future versions of the GNU Lesser General Public License shall
 apply, that proxy's public statement of acceptance of any version is
 permanent authorization for you to choose that version for the Library.</pre>
-	<hr>
-	<h2 id="vatlib">vatlib</h2>
-	<table>
-		<tr>
-			<td>Project website</td>
-			<td><a href="https://dev.vatsim.net" target="_parent" title="https://dev.vatsim.net" rel="nofollow">https://dev.vatsim.net</a></td>
-		</tr>
-		<tr>
-			<td>Source code</td>
-			<td><a href="https://dev.vatsim.net" target="_parent" title="https://dev.vatsim.net" rel="nofollow">https://dev.vatsim.net</a></td>
-		</tr>
-	</table>
-	<pre>
-		<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/80x15.png" /></a><br />This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>.
-	</pre>
-	<hr>
-	<h2 id="qtwebapp">QtWebApp</h2>
-	<table>
-		<tr>
-			<td>Project website</td>
-			<td><a href="http://stefanfrings.de/qtwebapp/index-en.html" target="_parent" title="QtWebApp HTTP Webserver in C++" rel="nofollow">QtWebApp HTTP Webserver in C++</a></td>
-		</tr>
-		<tr>
-			<td>Source code</td>
-			<td>See web site</td>
-		</tr>
-	</table>
-	<pre>
-		LGPL 3 as of 2/2019, see website above.
-	</pre>
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