Bump psycopg2 from 2.7.3 to 2.9.1

[dependabot-preview]

Bumps psycopg2 from 2.7.3 to 2.9.1.

Changelog

Sourced from psycopg2's changelog.

Current release

What's new in psycopg 2.9.1 ^^^^^^^^^^^^^^^^^^^^^^^^^^^

Fix regression with named sql.Placeholder (:ticket:1291).

What's new in psycopg 2.9

• with connection starts a transaction on autocommit transactions too (:ticket:[#941](https://github.com/psycopg/psycopg2/issues/941)).
• Timezones with fractional minutes are supported on Python 3.7 and following (:ticket:[#1272](https://github.com/psycopg/psycopg2/issues/1272)).
• Escape table and column names in ~cursor.copy_from() and ~cursor.copy_to().
• Connection exceptions with sqlstate 08XXX reclassified as ~psycopg2.OperationalError (a subclass of the previously used ~psycopg2.DatabaseError) (:ticket:[#1148](https://github.com/psycopg/psycopg2/issues/1148)).
• Include library dirs required from libpq to work around MacOS build problems (:ticket:[#1200](https://github.com/psycopg/psycopg2/issues/1200)).

Other changes:

• Dropped support for Python 2.7, 3.4, 3.5 (:tickets:[#1198](https://github.com/psycopg/psycopg2/issues/1198), [#1000](https://github.com/psycopg/psycopg2/issues/1000), [#1197](https://github.com/psycopg/psycopg2/issues/1197)).
• Dropped support for mx.DateTime.
• Use datetime.timezone objects by default in datetime objects instead of ~psycopg2.tz.FixedOffsetTimezone.
• The psycopg2.tz module is deprecated and scheduled to be dropped in the next major release.
• Provide :pep:599 wheels packages (manylinux2014 tag) for i686 and x86_64 platforms.
• Provide :pep:600 wheels packages (manylinux_2_24 tag) for aarch64 and ppc64le platforms.
• Wheel package compiled against OpenSSL 1.1.1k and PostgreSQL 13.3.
• Build system for Linux/MacOS binary packages moved to GitHub Actions.

What's new in psycopg 2.8.7 ^^^^^^^^^^^^^^^^^^^^^^^^^^^

• Accept empty params as ~psycopg2.connect() (:ticket:[#1250](https://github.com/psycopg/psycopg2/issues/1250)).
• Fix attributes refcount in Column initialisation (:ticket:[#1252](https://github.com/psycopg/psycopg2/issues/1252)).
• Allow re-initialisation of static variables in the C module (:ticket:[#1267](https://github.com/psycopg/psycopg2/issues/1267)).

What's new in psycopg 2.8.6 ^^^^^^^^^^^^^^^^^^^^^^^^^^^

... (truncated)

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