Update postgres

Changes:

• https://github.com/docker-library/postgres/commit/5beb1d4: Update to 9.4.25-1.pgdg90+1
• https://github.com/docker-library/postgres/commit/a0ec4f5: Update to 9.5.20
• https://github.com/docker-library/postgres/commit/6dfdc0e: Update to 11.6
• https://github.com/docker-library/postgres/commit/2addeda: Update to 11.6-1.pgdg90+1
• https://github.com/docker-library/postgres/commit/f13fbe5: Update to 9.6.16-1.pgdg90+1
• https://github.com/docker-library/postgres/commit/f2596e6: Update to 10.11-1.pgdg90+1
• https://github.com/docker-library/postgres/commit/c1e547b: Update to 10.11
• https://github.com/docker-library/postgres/commit/cac7a60: Update to 9.6.16
• https://github.com/docker-library/postgres/commit/1d43a9d: Update to 12.1
• https://github.com/docker-library/postgres/commit/06a831c: Update to 9.5.20-1.pgdg90+1
• https://github.com/docker-library/postgres/commit/138e959: Update to 9.4.25
• https://github.com/docker-library/postgres/commit/4a82eb9: Update to 12.1-1.pgdg100+1
• https://github.com/docker-library/postgres/commit/0c29c35: Merge pull request https://github.com/docker-library/postgres/pull/496 from infosiftr/functionalization
• https://github.com/docker-library/postgres/commit/8fada98: Fixes from tianon's review
• https://github.com/docker-library/postgres/commit/7c84645: Apply update.sh for new entrypoint
• https://github.com/docker-library/postgres/commit/d1cc089: Improve _is_sourced check
• https://github.com/docker-library/postgres/commit/6e85168: Resync function interfaces with MySQL, improve comments
• https://github.com/docker-library/postgres/commit/2e70e71: Apply function name changes as discussed in https://github.com/docker-library/mysql/pull/471
• https://github.com/docker-library/postgres/commit/49fb876: Namespace functions for less conflict when sourced
• https://github.com/docker-library/postgres/commit/48f2ad1: Functionalize the entrypoint to allow outside sourcing for extreme customizing of startup

该提问来源于开源项目：docker-library/official-images