Bump marshmallow from 3.26.2 to 4.2.2

[dependabot]

Bumps marshmallow from 3.26.2 to 4.2.2.

Changelog

Sourced from marshmallow's changelog.

4.2.2 (2026-02-04)

Bug fixes:

• Fix behavior of fields.Contant(None) (:issue:2868). Thanks :user:T90REAL for reporting and emmanuel-ferdman for the fix.

4.2.1 (2026-01-23)

Bug fixes:

• Fix validation of URLs beginning with uppercare FILE (:issue:2891). Thanks :user:thanhlecongg for reporting and fixing.

4.2.0 (2026-01-04)

Other changes:

• many argument of Nested properly overrides schema instance value (:pr:2854). Thanks :user:jafournier for the PR.

4.1.2 (2025-12-19)

Bug fixes:

• :cve:2025-68480: Merge error store messages without rebuilding collections. Thanks 카푸치노 for reporting and :user:deckar01 for the fix.

4.1.1 (2025-11-05)

Bug fixes:

• Ensure URL validator is case-insensitive when using custom schemes (:pr:2874). Thanks :user:T90REAL for the PR.

4.1.0 (2025-11-01)

Other changes:

• Add __len__ implementation to missing so that it can be used with validate.Length <marshmallow.validate.Length> (:pr:2861). Thanks :user:agentgodzilla for the PR.
• Drop support for Python 3.9 (:pr:2363).

... (truncated)

Commits

• 2a3812d Bump version and update changelog
• 19ca8dc Fix Constant field rejecting None values during load (#2894)
• 213ee3a [pre-commit.ci] pre-commit autoupdate (#2896)
• ba8b512 Update AUTHORS.rst
• 40105ad Bump version and update changelog
• 39e7c83 Merge pull request #2892 from thanhlecongg/fix-2891
• 78a94ea Fix docstring typo
• 8dc078e fix issue #2891
• c62b911 add tests for issue #2891
• d07bf5e [pre-commit.ci] pre-commit autoupdate (#2887)
• Additional commits viewable in compare view

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