Psycopg 2.8.6 released

What's new in psycopg 2.8.6
---------------------------

New features:

- Fixed memory leak changing connection encoding to the current one
  (:ticket:`#1101`).
- Fixed search of mxDateTime headers in virtualenvs (:ticket:`#996`).
- Added missing values from errorcodes (:ticket:`#1133`).
- `cursor.query` reports the query of the last :sql:`COPY` opearation too
  (:ticket:`#1141`).
- `~psycopg2.errorcodes` map and `~psycopg2.errors` classes updated to
  PostgreSQL 13.
- Added wheel packages for ARM architecture (:ticket:`#1125`).
- Wheel package compiled against OpenSSL 1.1.1g.
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