Sync flag icons with upstream

Upstream commit e0577caf317aa721b62c5a4788b13572cc163252 (Release v4.1.4)
PR #15657.

src/icons/flags/za.svg

@@ -1 +1,17 @@
-<svg viewBox="0 0 640 480" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><clipPath id="a"><path d="m-71.9 0h682.7v512h-682.7z"/></clipPath><g clip-path="url(#a)" transform="matrix(.93748 0 0 .93748 67.4 0)"><g fill-rule="evenodd" stroke-width="1pt"><path d="m-71.9 407.8v-303.4l225.9 151.7-226 151.7z"/><path d="m82.2 512.1 253.6-170.6h360.2v170.5h-613.8z" fill="#00c"/><path d="m66 0h630v170.8h-360.3s-266.4-172.5-269.7-170.8z" fill="#f00"/><path d="m-71.9 64v40.4l225.9 151.6-226 151.8v40.3l284.5-192-284.5-192.1z" fill="#fc0"/><path d="m-71.9 64v-64h95l301.2 204h371.8v104.2h-371.8l-301.3 203.8h-94.9v-63.9l284.4-192-284.3-192.1z" fill="#093"/><path d="m23 0h59.2l253.6 170.7h360.2v33.3h-371.7l-301.3-203.9zm0 512.1h59.2l253.6-170.6h360.2v-33.2h-371.7l-301.3 203.7z" fill="#fff"/></g></g></svg>
+<svg xmlns="http://www.w3.org/2000/svg" id="flag-icons-za" viewBox="0 0 640 480">
+  <defs>
+    <clipPath id="za-a">
+      <path fill-opacity=".7" d="M-71.9 0h682.7v512H-71.9z"/>
+    </clipPath>
+  </defs>
+  <g clip-path="url(#za-a)" transform="translate(67.4) scale(.93748)">
+    <g fill-rule="evenodd" stroke-width="1pt">
+      <path d="M-71.9 407.8V104.4L154 256.1-72 407.8z"/>
+      <path fill="#00c" d="m82.2 512.1 253.6-170.6H696V512H82.2z"/>
+      <path fill="red" d="M66 0h630v170.8H335.7S69.3-1.7 66 0z"/>
+      <path fill="#fc0" d="M-71.9 64v40.4L154 256-72 407.8v40.3l284.5-192L-72 64z"/>
+      <path fill="#093" d="M-71.9 64V0h95l301.2 204h371.8v104.2H324.3L23 512h-94.9v-63.9l284.4-192L-71.8 64z"/>
+      <path fill="#fff" d="M23 0h59.2l253.6 170.7H696V204H324.3L23 .1zm0 512.1h59.2l253.6-170.6H696v-33.2H324.3L23 512z"/>
+    </g>
+  </g>
+</svg>