Bump serde_json from 1.0.62 to 1.0.64

Sourced from serde_json's releases.

v1.0.64

• Fix deserialization panic on deserializing RawValue from a slice containing non-utf8 bytes (#755)

v1.0.63

• Provide Entry::and_modify method on serde_json::map::Entry (#754, thanks @​Krout0n)

• d0d8078 Release 1.0.64
• 8d3b890 Fix IoRead's raw buffering on invalid utf-8 as well
• 054326e Merge pull request #757 from serde-rs/panicraw
• c64c1d7 Fix panic deserializing RawValue from invalid utf-8 bytes
• 2f812d0 Add test of RawValue deserialization from invalid utf-8
• 9bcb08f Fix unnecessary trailing semicolon lints in test suite
• d400899 Release 1.0.63
• 461f2bf Merge pull request 754 from Krout0n/entry#and_modify
• 6e140a9 Add Entry::and_modify
• 64dd1e0 Merge pull request #752 from SamuelQZQ/patch-2
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