fix(sitemap): update last modified date to 2025-11-12

Author: jnton

public/sitemap.xml

@@ -2,7 +2,7 @@
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
   <url>
     <loc>https://yourselftoscience.org/</loc>
-    <lastmod>2025-11-07</lastmod>
+    <lastmod>2025-11-12</lastmod>
     <changefreq>weekly</changefreq>
     <priority>1.0</priority>
   </url>