Bump serde from 1.0.123 to 1.0.125

[dependabot-preview]

Bumps serde from 1.0.123 to 1.0.125.

Release notes

Sourced from serde's releases.

v1.0.125

• Improve performance of serializing Ipv4Addr (#2001, thanks @saethlin)

v1.0.124

• Fix possible panic deserializing invalid data as SystemTime (#1997, thanks @cyang1)

Commits

• e9270e5 Release 1.0.125
• 72060b7 Extend test_format_u8 to include u8::MAX
• 1bb23ad Remove format_u8 when not used by Ipv4Addr impl
• 9be4c96 Merge pull request 2001 from saethlin/optimize-ipaddr
• 4114e90 Fix off-by-one mistake, explain the offset
• 8bb07b0 skip UTF8 checking and initialize with b'.'
• ba8c1d6 use the algorithm from itoa
• 857a805 Faster Ipv4 serialization prototype
• 5a8dcac Release 1.0.124
• 697b082 Touch up PR 1997
• Additional commits viewable in compare view

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