add interim API refs

Author: josh-heyer

product_docs/docs/postgres_for_kubernetes/1/pg4k.v1/index.mdx

@@ -6,12 +6,14 @@ navigation:
   - v1.25.0
   - v1.24.1
   - v1.24.0
+  - v1.23.6
   - v1.23.5
   - v1.23.4
   - v1.23.3
   - v1.23.2
   - v1.23.1
   - v1.23.0
+  - v1.22.8
   - v1.22.7
   - v1.22.6
   - v1.22.5