Fix code scanning alert no. 35: Incomplete string escaping or encoding

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: Farzad Hayat

lib/rssfeed.cjs

@@ -58,7 +58,7 @@ module.exports.register = function ({ config }) {
                         title: linkElement.text(),
                         link: `${siteLinkWithVersion}/${linkElement
                             .attr("href")
-                            .replace("../", "")}`,
+                            .replace(/\.\.\//g, "")}`,
                         description: `Changelog for TinyMCE ${version}`,
                         guid: version,
                         pubDate: new Date(date).toUTCString(),