Add version 3.10

Author: josh-wong

src/pages/unsupported-versions.mdx

@@ -5,6 +5,7 @@
 
 The following versions of ScalarDB are no longer supported:
 
+- [ScalarDB 3.10](/docs/3.10/)
 - [ScalarDB 3.9](/docs/3.9/)
 - [ScalarDB 3.8](/docs/3.8/)
 - [ScalarDB 3.7](/docs/3.7/)