build(deps): Bump serde from 1.0.197 to 1.0.198

[dependabot[bot]]

Bumps serde from 1.0.197 to 1.0.198.

Release notes

Sourced from serde's releases.

v1.0.198

• Support serializing and deserializing Saturating<T> (#2709, thanks @​jbethune)

Commits

• c4fb923 Release 1.0.198
• 65b7eea Merge pull request #2729 from dtolnay/saturating
• 01cd696 Integrate Saturating<T> deserialization into impl_deserialize_num macro
• c13b3f7 Format PR 2709
• a6571ee Merge pull request #2709 from jbethune/master
• 6e38aff Revert "Temporarily disable miri on doctests"
• 3d1b19e Implement Ser+De for Saturating\<T>
• 5b24f88 Resolve legacy_numeric_constants clippy lints
• 74d0670 Explicitly install a Rust toolchain for cargo-outdated job
• 3bfab6e Temporarily disable miri on doctests
• Additional commits viewable in compare view

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