[GH Action] Update release tags and commit SHAs for arabica (#2321)

* [automated GH action] update latest release tags & commit sha (arabica)

* Apply suggestions from code review

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

---------

Co-authored-by: jcstein <[email protected]>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: jcstein

.vitepress/constants/arabica_versions.js

@@ -1,6 +1,6 @@
 const arabicaVersions = Object.freeze({
-  "app-latest-tag": "v6.3.0-arabica",
-  "app-latest-sha": "55bd178f1bfea98b306675b02864782e3fadf10e",
+  "app-latest-tag": "v6.4.0-arabica",
+  "app-latest-sha": "81a4ab5f1bf39132c831ac89c979f46466294d21",
   "node-latest-tag": "v0.28.4-arabica",
   "node-latest-sha": "52cd8b52ec031bb9e3b4e476e0b159db2053384c",
 });