Update organization LinkedIn URL

Points the site-wide LinkedIn link (header/footer social icon) at
the correct company page slug.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: Mazizova

hugo.yaml

@@ -7,7 +7,7 @@ params:
   tagline: "The Future of MySQL Ecosystem"
   social:
     twitter: "OurSQLFdn"
-    linkedin: "https://www.linkedin.com/company/oursql-foundation"
+    linkedin: "https://www.linkedin.com/company/oursqlfoundation/"
     x: "https://x.com/OurSQLFdn"
     github: "https://github.com/OurSQLFoundation"
     mastodon: "https://mastodon.social/@oursqlfoundation"