Marshmallow

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Bug fixes:

- Fix error message when field is declared as a class and not an instance (:issue:`2245`).
Thanks :user:`travnick` for reporting.

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Bug fixes:

- Fix validation of ``URL`` fields to allow missing user field,
per NWG RFC 3986 (:issue:`2232`). Thanks :user:`ddennerline3` for reporting
and :user:`deckar01` for the PR.

Other changes:

- *Backwards-incompatible*: ``__version__``, ``__parsed_version__``, and ``__version_info__``
attributes are deprecated (:issue:`2227`). Use feature detection or
``importlib.metadata.version("marshmallow")`` instead.

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Bug fixes:

- Fix ``Nested`` field type hint for lambda ``Schema`` types (:pr:`2164`).
Thanks :user:`somethingnew2-0` for the PR.

Other changes:

- Officially support Python 3.12 (:pr:`2188`).
Thanks :user:`hugovk` for the PR.

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Bug fixes:

- Fix call to ``get_declared_fields``: pass ``dict_cls`` again (:issue:`2152`).
Thanks :user:`Cheaterman` for reporting.

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Features:

- Add ``absolute`` parameter to ``URL`` validator and ``Url`` field (:pr:`2123`).
Thanks :user:`sirosen` for the PR.
- Use Abstract Base Classes to define ``FieldABC`` and ``SchemaABC``
(:issue:`1449`). Thanks :user:`aditkumar72` for the PR.
- Use `OrderedSet` as default `set_class`. Schemas are now ordered by default.
(:issue:`1744`)

Bug fixes:

- Handle ``OSError`` and ``OverflowError`` in ``utils.from_timestamp`` (:pr:`2102`).
Thanks :user:`TheBigRoomXXL` for the PR.
- Fix the default inheritance of nested partial schemas (:issue:`2149`).
Thanks :user:`matejsp` for reporting.

Other changes:

- Officially support Python 3.11 (:pr:`2067`).
- Drop support for Python 3.7 (:pr:`2135`).

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Features:

- Add ``timestamp`` and ``timestamp_ms`` formats to ``fields.DateTime``
(:issue:`612`).
Thanks :user:`vgavro` for the suggestion and thanks :user:`vanHoi` for
the PR.