build(deps): bump serde from 1.0.185 to 1.0.188

[dependabot[bot]]

Bumps serde from 1.0.185 to 1.0.188.

Release notes

Sourced from serde's releases.

v1.0.188

• Fix "failed to parse manifest" error when building serde using a Cargo version between 1.45 and 1.50 (#2603)

v1.0.187

• Remove support for Emscripten targets on rustc older than 1.40 (#2600)

v1.0.186

• Disallow incompatible versions of serde_derive and serde in the dependency graph (#2588, thanks @​soqb)

Commits

• dad15b9 Release 1.0.188
• d89c19f Revert "Adopt new Cargo feature resolver"
• 146dc0f Release 1.0.187
• d26852d Merge pull request #2602 from dtolnay/resolver
• e1c2724 Adopt new Cargo feature resolver
• dbbfe7a Merge pull request #2600 from dtolnay/oldemscripten
• dc24d12 Clean up all usage of serde_if_integer128
• 4e7533e Remove support for emscripten targets on rustc older than 1.40
• 5d03651 Release 1.0.186
• a741293 Merge pull request #2599 from dtolnay/encodeutf8
• Additional commits viewable in compare view

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