1.3.925

• Address #275 by noting that PostgreSQL may perform additional SQL queries to produce table names used in qualified result set builders.
• Address #274 by adding next.jdbc.sql/aggregate-by-keys as a convenient wrapper around find-by-keys when you want just a single aggregate value back (such as count, max, etc).
• Address #273 by linking to PG2 in the PostgreSQL Tips & Tricks section.
• Address #268 by expanding the documentation around insert-multi! and insert!.
• Update dependency versions (including Clojure).
• Code cleanup per clj-kondo.