build(deps): bump psycopg2-binary from 2.9.1 to 2.9.3 in /backend

[dependabot]

Bumps psycopg2-binary from 2.9.1 to 2.9.3.

Changelog

Sourced from psycopg2-binary's changelog.

Current release

What's new in psycopg 2.9.3 ^^^^^^^^^^^^^^^^^^^^^^^^^^^

• Alpine (musl) wheels now available (:ticket:[#1148](https://github.com/psycopg/psycopg2/issues/1148)).

What's new in psycopg 2.9.2 ^^^^^^^^^^^^^^^^^^^^^^^^^^^

• Raise ValueError for dates >= Y10k (:ticket:[#1307](https://github.com/psycopg/psycopg2/issues/1307)).
• ~psycopg2.errorcodes map and ~psycopg2.errors classes updated to PostgreSQL 14.
• Add preliminary support for Python 3.11 (:tickets:[#1376](https://github.com/psycopg/psycopg2/issues/1376), [#1386](https://github.com/psycopg/psycopg2/issues/1386)).
• Wheel package compiled against OpenSSL 1.1.1l and PostgreSQL 14.1 (:ticket:[#1388](https://github.com/psycopg/psycopg2/issues/1388)).

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

Fix regression with named sql.Placeholder (:ticket:[#1291](https://github.com/psycopg/psycopg2/issues/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

... (truncated)

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