Blog: add missing rippled release to sidebar

Author: mDuo13

blog/sidebars.yaml

@@ -7,6 +7,7 @@
       expanded: false
       items:
         - page: 2024/clio-2.2.2.md
+        - page: 2024/rippled-2.2.1.md
         - page: 2024/filedgr.md
         - page: 2024/clio-2.2.1.md
         - page: 2024/clio-2.2.0.md