Bump marshmallow from 3.21.1 to 3.21.3

[dependabot[bot]]

Bumps marshmallow from 3.21.1 to 3.21.3.

Changelog

Sourced from marshmallow's changelog.

3.21.3 (2024-06-05)

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Bug fixes:

• Fix memory leak that prevented schema instances from getting GC'd (:pr:2277). Thanks :user:mrcljx for the PR.

3.21.2 (2024-05-01)

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Bug fixes:

• Allow timestamp 0 in fields.DateTime (:issue:2133). Thanks :user:flydzen for reporting.

Commits

• b9646e3 Bump version and update changelog
• 99103a6 Remove leaky lru_cache (#2277)
• 47205b5 [pre-commit.ci] pre-commit autoupdate (#2276)
• aaecd5b [pre-commit.ci] pre-commit autoupdate
• c592536 [pre-commit.ci] pre-commit autoupdate (#2269)
• ee0c903 [pre-commit.ci] pre-commit autoupdate
• d4fd5a4 [pre-commit.ci] pre-commit autoupdate
• 511b8c5 Bump version and update changelog
• 03f56a4 Merge pull request #2264 from marshmallow-code/allow_timestamp_0
• 58fbbcd Encapsulate timestamp boolean check in utils
• Additional commits viewable in compare view

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