Update rmp-serde requirement from 0.15.4 to 1.3.0

[dependabot[bot]]

Updates the requirements on rmp-serde to permit the latest version.

Commits

• 52de9be Bump
• c1b19aa Update README
• 454e0c5 Smaller integer for depth
• 143897c Update README
• 7ddcd2e Decoder/inspector example
• f9f02d8 Simplify Marker match by reusing discriminant
• 926682d Smaller write len
• 06414f5 Handle OOM when writing
• 80e00b3 Bump
• 6dd81ee Hack to use bytes
• Additional commits viewable in compare view

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