Bump psycopg2 from 2.7 to 2.7.5

[dependabot-preview]

Bumps psycopg2 from 2.7 to 2.7.5.

Changelog

Sourced from psycopg2's changelog.

Current release

What's new in psycopg 2.8

New features:

• Added ~psycopg2.errors module. Every PostgreSQL error is converted into
  a specific exception class (:ticket:#682).
• Added ~psycopg2.extensions.encrypt_password() function (:ticket:#576).
• Added ~psycopg2.extensions.Column.table_oid and
  ~psycopg2.extensions.Column.table_column attributes on cursor.description
  items (:ticket:#661).
• Added connection.info object to retrieve various PostgreSQL connection
  information (:ticket:#726).
• ~psycopg2.sql.Identifier can represent qualified names in SQL composition
  (:ticket:#732).
• !str() on ~psycopg2.extras.Range produces a human-readable representation
  (:ticket:#773).
• ~psycopg2.extras.DictCursor and ~psycopg2.extras.RealDictCursor rows
  maintain columns order (:ticket:#177).
• Added !severity_nonlocalized attribute on the
  ~psycopg2.extensions.Diagnostics object (:ticket:#783).

Other changes:

• Dropped support for Python 2.6, 3.2, 3.3.
• Dropped psycopg1 module.
• Dropped deprecated !register_tstz_w_secs() (was previously a no-op).
• No longer use 2to3 during installation for Python 2 & 3 compatability. All
  source files are now compatible with Python 2 & 3 as is.
• The !psycopg2.test package is no longer installed by python setup.py install.

What's new in psycopg 2.7.6
^^^^^^^^^^^^^^^^^^^^^^^^^^^

• Close named cursors if exist, even if ~cursor.execute() wasn't called
  (:ticket:#746).
• Fixed building on modern FreeBSD versions with Python 3.7 (:ticket:#755).
• Fixed hang trying to :sql:COPY via ~cursor.execute() (:ticket:#781).
• Fixed adaptation of arrays of empty arrays (:ticket:#788).
• Fixed segfault accessing the connection.readonly and
  connection.deferrable repeatedly (:ticket:#790).
• ~psycopg2.extras.execute_values() accepts ~psycopg2.sql.Composable
  objects (#794).
• ~psycopg2.errorcodes map updated to PostgreSQL 11.

... (truncated)

Commits

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