DBI PostgreSQL interface

Changes for 3.18.0

• Support new PQclosePrepared function, added in Postgres 17
• Better docs about ping always returning a value (Github issue #121)

It's Perl support for AWS Lambda Custom Runtime.

Changes for 0.3.0 - 2023-09-04T11:31:05Z

• AWS Lambda Functions powered by AWS Graviton2 now available in 6 additional regions #121
• disable HTTP timeout #119
• bump Mozilla::CA 20230821 #120