Bump serde from 1.0.200 to 1.0.201

Bumps serde from 1.0.200 to 1.0.201.

Release notes

Sourced from serde's releases.

v1.0.201

• Resolve unexpected_cfgs warning (#2737)

Commits

• b4f1bc1 Release 1.0.201
• 029ab46 Merge pull request #2737 from dtolnay/checkcfg
• 220ca0c Resolve unexpected_cfgs warning
• 20306f4 Fix cfg on test_systemtime_overflow
• See full diff in compare view

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