build(deps): bump serde_with from 3.20.0 to 3.21.0 in the cargo group

[dependabot]

Bumps the cargo group with 1 update: serde_with.

Updates serde_with from 3.20.0 to 3.21.0

Release notes

Sourced from serde_with's releases.

serde_with v3.21.0

Security

• GHSA-7gcf-g7xr-8hxj: KeyValueMap serialization panics on empty sequence or map entries Bad or attacker controlled values could cause a panic while allocating too large values. Fixed in #966 by setting a maximum allocation size during the creation of collections like Vec or sets.

  Thanks to @​7thParkk for reporting the issue.

Added

• Add NoneAsZero adapter that maps Option<NonZero*> to a plain integer, encoding None as 0 by @​SAY-5 (#486)

Changed

• Re-enable link-to-definition on docs.rs (#964)

Fixed

• Fix some doc links to point to the correct types (#963)
• Re-enable unused_qualifications and fix the resulting findings by @​lms0806 (#962)

Commits

• 0f4ca67 Update changelog for 3.21.0 (#967)
• 7654841 Update changelog for 3.21.0
• c8a1d82 Protect all collection creations against capacity overflow by using `size_hin...
• 6ad5fa5 Properly feature gate the vec_with_capacity_cautious function
• ef7d141 Protect all collection creations against capacity overflow by using `size_hin...
• a348da3 Add serde_as deserialize_as explain (#958)
• 2e5bc20 Bump the github-actions group with 3 updates (#965)
• 927a3d6 Bump the github-actions group with 3 updates
• 62d14ec Enable link-to-definition on docs.rs again, after the upstream issue was reso...
• 4584d94 Enable link-to-definition on docs.rs again, after the upstream issue was reso...
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