build(deps): bump serde from 1.0.166 to 1.0.168

[dependabot[bot]]

Bumps serde from 1.0.166 to 1.0.168.

Release notes

Sourced from serde's releases.

v1.0.168

• Allow serde::de::IgnoredAny to be the type for a serde(flatten) field (#2436, thanks @​Mingun)
• Allow larger preallocated capacity for smaller elements (#2494)

v1.0.167

• Add serialize and deserialize impls for RangeFrom and RangeTo (#2471, thanks @​tbu-)

Commits

• 09b78b2 Release 1.0.168
• a622b8a Merge pull request #2495 from dtolnay/cautious
• 399ef08 Allow larger preallocated capacity for smaller elements
• 3686277 Merge pull request #2436 from Mingun/flatten-ignored-any
• 807bd20 Release 1.0.167
• ed9a140 Merge pull request #2444 from Mingun/dedup
• 2de7c2b Resolve redundant_static_lifetimes clippy lint from PR 2471
• e6a4a37 Delete unuseful RangeFull impls
• 0fca04e Merge pull request 2471 from tbu-/pr_more_ranges
• 92bfc8d Merge pull request #2290 from Mingun/enum-tests-and-cleanup
• Additional commits viewable in compare view

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