py-mongo: updated to 3.12.0

Changes in Version 3.12.0
-------------------------

.. warning:: PyMongo 3.12.0 deprecates support for Python 2.7, 3.4 and 3.5.
   These Python versions will not be supported by PyMongo 4.

.. warning:: PyMongo now allows insertion of documents with keys that include
   dots ('.') or start with dollar signs ('$').

- PyMongoCrypt 1.1.0 or later is now required for client side field level
  encryption support.

Notable improvements
....................

- Added support for MongoDB 5.0.
- Support for MongoDB Versioned API, see :class:`~pymongo.server_api.ServerApi`.
- Support for snapshot reads on secondaries (see :ref:`snapshot-reads-ref`).
- Support for Azure and GCP KMS providers for client side field level
  encryption. See the docstring for :class:`~pymongo.mongo_client.MongoClient`,
  :class:`~pymongo.encryption_options.AutoEncryptionOpts`,
  and :mod:`~pymongo.encryption`.
- Support AWS authentication with temporary credentials when connecting to KMS
  in client side field level encryption.
- Support for connecting to load balanced MongoDB clusters via the new
  ``loadBalanced`` URI option.
- Support for creating timeseries collections via the ``timeseries`` and
  ``expireAfterSeconds`` arguments to
  :meth:`~pymongo.database.Database.create_collection`.
- Added :attr:`pymongo.mongo_client.MongoClient.topology_description`.
- Added hash support to :class:`~pymongo.mongo_client.MongoClient`,
  :class:`~pymongo.database.Database` and
  :class:`~pymongo.collection.Collection` (`PYTHON-2466`_).
- Improved the error message returned by
  :meth:`~pymongo.collection.Collection.insert_many` when supplied with an
  argument of incorrect type (`PYTHON-1690`_).
- Added session and read concern support to
  :meth:`~pymongo.collection.Collection.find_raw_batches`
  and :meth:`~pymongo.collection.Collection.aggregate_raw_batches`.

Bug fixes
.........

- Fixed a bug that could cause the driver to deadlock during automatic
  client side field level encryption (`PYTHON-2472`_).
- Fixed a potential deadlock when garbage collecting an unclosed exhaust
  :class:`~pymongo.cursor.Cursor`.
- Fixed an bug where using gevent.Timeout to timeout an operation could
  lead to a deadlock.
- Fixed the following bug with Atlas Data Lake. When closing cursors,
  pymongo now sends killCursors with the namespace returned the cursor's
  initial command response.
- Fixed a bug in :class:`~pymongo.cursor.RawBatchCursor` that caused it to
  return an empty bytestring when the cursor contained no results. It now
  raises :exc:`StopIteration` instead.

Deprecations
............

- Deprecated support for Python 2.7, 3.4 and 3.5.
- Deprecated support for database profiler helpers
  :meth:`~pymongo.database.Database.profiling_level`,
  :meth:`~pymongo.database.Database.set_profiling_level`,
  and :meth:`~pymongo.database.Database.profiling_info`. Instead, users
  should run the `profile command`_ with the
  :meth:`~pymongo.database.Database.command` helper directly.
- Deprecated :exc:`~pymongo.errors.NotMasterError`. Users should
  use :exc:`~pymongo.errors.NotPrimaryError` instead.
- Deprecated :class:`~pymongo.ismaster.IsMaster` and :mod:`~pymongo.ismaster`
  which will be removed in PyMongo 4.0 and are replaced by
  :class:`~pymongo.hello.Hello` and :mod:`~pymongo.hello` which provide the
  same API.
- Deprecated the :mod:`pymongo.messeage` module.
- Deprecated the ``ssl_keyfile`` and ``ssl_certfile`` URI options in favor
  of ``tlsCertificateKeyFile`` (see :doc:`examples/tls`).


(adam)