Sync flag icons with upstream

* Includes all 268 flags.
* Upstream commit `a7b7c3c55560cb39d96e70324876e1bb5b1c625b` - (Release v6.11.0)
* Flags source from (zip): https://github.com/lipis/flag-icons/releases/tag/v6.11.0

PR #19518.

src/icons/flags/li.svg

@@ -2,7 +2,7 @@
   <path fill="#002b7f" d="M0 0h640v240H0z"/>
   <path fill="#ce1126" d="M0 240h640v240H0z"/>
   <g fill="#ffd83d" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" transform="scale(.8)">
-    <g id="a">
+    <g id="li-a">
       <path stroke="none" d="m216.4 122.3-1.9 62.5h-63.4c-7.8-15.2-14.2-28-14.2-45.5 0-14.6 11.5-26.2 28-26.2 17.5 0 36.8 5.9 51.5 9.2z"/>
       <g stroke-width="1.5">
         <path d="M144.5 125.2v36m5-39.7v48m5.2-50.5v57.2m5-58.4v44.9m5.1-45.1v45.3m5.1-47v47m5.1-47v47m5.1-46.5v47m5.1-46.5v46.9m5.1-44v47m5-46.5v52.9m5.2-52.9v47m5-47v47"/>
@@ -22,7 +22,7 @@
       <circle cx="130.2" cy="157.2" r="4.9"/>
       <path d="m215 119.5-.5 6.5c-12.3-2-29.7-8.8-46-8.8-15 0-26.6 6-26.6 21.2 0 14.9 6.3 28.5 14.7 42.3l-8.7 4c-7.8-15-14.3-28-14.3-45.4 0-14.6 11.5-29 31.3-29 17.5 0 35.4 6 50.1 9.2z"/>
     </g>
-    <use xlink:href="#a" width="100%" height="100%" transform="matrix(-1 0 0 1 444 0)"/>
+    <use xlink:href="#li-a" width="100%" height="100%" transform="matrix(-1 0 0 1 444 0)"/>
     <path d="m222 53.1-5.2 9.7 5.2 9.6 5.1-9.6L222 53zm0 24.4-5.2 9.6 5.2 9.7 5-9.8-5.1-9.6zM203.6 75l8.1 5.1 8.1-5.1-8-5.2-8.2 5.2zm20.5 0 8.1 5.1 8.2-5.1-8.2-5.2-8 5.2z"/>
     <circle cx="222" cy="75.1" r="3.9"/>
     <circle cx="222" cy="100" r="10.5"/>