Update HA version badge to 2026.9.4

ha-version-badge.svg

@@ -1,13 +1,13 @@
 <svg width="61.5" height="20" viewBox="0 0 615 200" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="2026.9.4">
   <title>2026.9.4</title>
-  <linearGradient id="cKkxn" x2="0" y2="100%">
+  <linearGradient id="uqxVv" x2="0" y2="100%">
     <stop offset="0" stop-opacity=".1" stop-color="#EEE"/>
     <stop offset="1" stop-opacity=".1"/>
   </linearGradient>
-  <mask id="XYkWp"><rect width="615" height="200" rx="30" fill="#FFF"/></mask>
-  <g mask="url(#XYkWp)">
+  <mask id="kTadM"><rect width="615" height="200" rx="30" fill="#FFF"/></mask>
+  <g mask="url(#kTadM)">
     <rect width="615" height="200" fill="#08C" x="0"/>
-    <rect width="615" height="200" fill="url(#cKkxn)"/>
+    <rect width="615" height="200" fill="url(#uqxVv)"/>
   </g>
   <g aria-hidden="true" text-anchor="start" font-family="Verdana,DejaVu Sans,sans-serif" font-size="110">
     <text x="65" y="148" textLength="500" fill="#000" opacity="0.25">2026.9.4</text>