Update version picker for element-hq (#16880)

changelog.d/16880.doc

+The version picker now correctly lists versions after `v1.98.0`.

docs/website_files/version-picker.js

@@ -54,7 +54,7 @@ function fetchVersions(dropdown, dropdownMenu) {
     return new Promise((resolve, reject) => {
         window.addEventListener("load", () => {
 
-            fetch("https://api.github.com/repos/matrix-org/synapse/git/trees/gh-pages", {
+            fetch("https://api.github.com/repos/element-hq/synapse/git/trees/gh-pages", {
                 cache: "force-cache",
             }).then(res => 
                 res.json()
@@ -124,4 +124,4 @@ function changeVersion(url, newVersion) {
     parsedURL.pathname = pathSegments.join('/');
   
     return parsedURL.href;
-}
\ No newline at end of file
+}