postgresql-timescaledb: update to 2.0.1

TimescaleDB 2.0 adds the much-anticipated support for distributed
hypertables (multi-node TimescaleDB), as well as new features and
enhancements to core functionality to give users better clarity and
more control and flexibility over their data.

This release also adds:

- Support for user-defined actions, allowing users to define,
  customize, and schedule automated tasks, which can be run by the
  built-in jobs scheduling framework now exposed to users.
- Significant changes to continuous aggregates, which now separate the
  view creation from the policy. Users can now refresh individual
  regions of the continuous aggregate materialized view, or schedule
  automated refreshing via policy.
- Redesigned informational views, including new (and more general)
  views for information about hypertable's dimensions and chunks,
  policies and user-defined actions, as well as support for multi-node
  TimescaleDB.
- Moving all formerly enterprise features into our Community Edition,
  and updating Timescale License, which now provides additional (more
  permissive) rights to users and developers.

Some of the changes above (e.g., continuous aggregates, updated
informational views) do introduce breaking changes to APIs and are not
backwards compatible. While the update scripts in TimescaleDB 2.0 will
upgrade databases running TimescaleDB 1.x automatically, some of these
API and feature changes may require changes to clients and/or upstream
scripts that rely on the previous APIs. Before upgrading, we recommend
reviewing upgrade documentation at docs.timescale.com for more details.

(tnn)