Upgrade to postgresql-12.0

PostgreSQL 12 enhancements include notable improvements to query
performance, particularly over larger data sets, and overall space
utilization. This release provides application developers with new
capabilities such as SQL/JSON path expression support, optimizations for
how common table expression ("WITH") queries are executed, and generated
columns. The PostgreSQL community continues to support the extensibility
and robustness of PostgreSQL, with further additions to
internationalization, authentication, and providing easier ways to
administrate PostgreSQL. This release also introduces the pluggable
table storage interface, which allows developers to create their own
methods for storing data.

"The development community behind PostgreSQL contributed features for
PostgreSQL 12 that offer performance and space management gains that our
users can achieve with minimal effort, as well as improvements in
enterprise authentication, administration functionality, and SQL/JSON
support." said Dave Page, a core team member of the PostgreSQL Global
Development Group. "This release continues the trend of making it easier
to manage database workloads large and small while building on
PostgreSQL's reputation of flexibility, reliability and stability in
production environments."

Release notes: https://www.postgresql.org/about/news/1976/