dev-perl/DBD-Pg: Bump to version 3.7.0

dev-perl/DBD-Pg: Bump to version 3.7.0

- Radically improve test coverage
  - Previously ran no tests
  - Now runs basic tests and compile tests without needing a database
  - checks for database being configured
  - if database is configured for testing, tests run
  - See https://wiki.gentoo.org/wiki/Project:Perl/maint-notes/dev-perl/DBD-Pg

Upstream:
- Use PQexec instead of PQexecParams when no placeholders
- Fix tests w/ server w/o UTF8
- Fix crash with missing client_encoding
- Fix crash with missing server_version
- Fix leak in ->state methods
- Add pg_async_status field in statement handles.

Package-Manager: Portage-2.3.8, Repoman-2.3.3