- Update to 1.5.8:
  * Fixed regression caused by SQLAlchemy 1.4 where the "alembic current"
    command would fail due to changes in the ``URL`` object.
  * Add async template to Alembic to bootstrap environments that use
    async DBAPI. Updated the cookbook to include a migration guide
    on how to adapt an existing enviroment for use with DBAPI drivers.
  * Fixed bug in versioning model where a downgrade across a revision with a
    dependency on another branch, yet an ancestor is also dependent on that
    branch, would produce an erroneous state in the alembic_version table,
    making upgrades impossible without manually repairing the table.
  * Changed the default ordering of "CREATE" and "DROP" statements indexes and
    unique constraints within the autogenerate process, so that for example in
    an upgrade() operation, a particular index or constraint that is to be
    replaced such as for a casing convention change will not produce any naming
    conflicts.
  * Fixed issue where autogenerate rendering of ``op.alter_column()`` would
    fail to include MySQL ``existing_nullable=False`` if the column were part
    of a primary key constraint within the table metadata.
  * Added support for rendering of "identity" elements on
    :class:`.Column` objects, supported in SQLAlchemy via
    the :class:`.Identity` element introduced in version 1.4.
  * Adding columns with identity is supported on PostgreSQL,
    MSSQL and Oracle. Changing the identity options or removing
    it is supported only on PostgreSQL and Oracle.
  * To accommodate SQLAlchemy 1.4 and 2.0, the migration model now no longer
    assumes that the SQLAlchemy Connection will autocommit an individual
    operation.
  * Modified the ``add_column()`` operation such that the ``Column`` object in
    use is shallow copied to a new instance if that ``Column`` is already
    attached to a ``table()`` or ``Table``.
  * Added rendering for the ``Table.prefixes`` element to autogenerate so that
    the rendered Python code includes these directives.
  * Alembic 1.5.0 now supports **Python 2.7 and Python 3.6 and above**, as well
    as **SQLAlchemy 1.3.0 and above**.
  * Add ``__main__.py`` file to alembic package to support invocation
    with ``python -m alembic``.
  * Removed deprecated ``--head_only`` option to the ``alembic current``
    command
- Drop pytest_depr_from_parent.patch, pytest plugin no longer used.

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