:arrow_up: Bump marshmallow from 3.21.1 to 3.21.2

[dependabot[bot]]

Bumps marshmallow from 3.21.1 to 3.21.2.

Changelog

Sourced from marshmallow's changelog.

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

• 511b8c5 Bump version and update changelog
• 03f56a4 Merge pull request #2264 from marshmallow-code/allow_timestamp_0
• 58fbbcd Encapsulate timestamp boolean check in utils
• 6e72beb DateTime field: reject timestamp True/False
• 845f573 DateTime field: allow timestamp 0
• 183c411 Merge pull request #2263 from marshmallow-code/pre-commit-ci-update-config
• 2d6e5c2 Use format specifiers instead of percent format
• a2ee924 [pre-commit.ci] pre-commit autoupdate
• 38dc356 [pre-commit.ci] pre-commit autoupdate
• ccc8c72 Bump sphinx from 7.3.6 to 7.3.7
• Additional commits viewable in compare view

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