build(deps): bump marshmallow from 3.14.0 to 3.15.0 in /requirements

[dependabot[bot]]

Bumps marshmallow from 3.14.0 to 3.15.0.

Changelog

Sourced from marshmallow's changelog.

3.15.0 (2022-03-12)

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Features:

• Allow passing a dict to fields.Nested (:pr:1935). Thanks :user:sirosen for the PR.

Other changes:

• Address distutils deprecation warning in Python 3.10 (:pr:1903). Thanks :user:kkirsche for the PR.
• Add py310 to black target-version (:pr:1921).
• Drop support for Python 3.6 (:pr:1923).
• Use postponed evaluation of annotations (:pr:1932). Thanks :user:Isira-Seneviratne for the PR.

3.14.1 (2021-11-13)

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Bug fixes:

• Fix publishing type hints per PEP-561 <https://www.python.org/dev/peps/pep-0561/>_ (:pr:1905). Thanks :user:bwindsor for the catch and patch.

Commits

• f251dfb Bump version and update changelog
• ff633b2 Allow fields.Nested to consume a dict (#1935)
• dc3bab4 Bump mypy from 0.931 to 0.940
• ec5c816 Merge pull request #1952 from marshmallow-code/doc_quickstart_load_default
• 60ebeb1 Update quickstart about load/dump_default
• da33e6a Run pre-commit autoupdate
• cf7adbe Bump sphinx from 4.3.2 to 4.4.0
• 58c2045 Bump flake8-bugbear from 21.11.29 to 22.1.11
• c1b2815 Bump sphinx-issues from 2.0.0 to 3.0.1
• dab1b03 Fix type information for __version_info__ to handle prereleases (#1925)
• Additional commits viewable in compare view

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