pg_vault_tde v1.7.1 : Transparent Data Encryption for PostgreSQL 17 and 18

pg_vault_tde 1.7.1 adds Transparent Data Encryption for PostgreSQL 17/18, encrypting each tuple with AES-256-GCM and supporting external key stores like HashiCorp Vault. The update fixes AAD derivation for TOAST data, requiring export of older TOAST rows before upgrade. Packages are available via GitHub and PGXN.