Update version referenced in docs

Author: Bret McGuire

docs.yaml

@@ -50,7 +50,7 @@ links:
     href:  https://github.com/datastax/ruby-driver/releases
 versions:
   - name: 3.2
-    ref: v3.2.3
+    ref: v3.2.4
   - name: 3.1
     ref: v3.1.0
   - name: 3.0