Bump serde_json from 1.0.48 to 1.0.50

[dependabot-preview[bot]]

Bumps serde_json from 1.0.48 to 1.0.50.

Release notes

Sourced from serde_json's releases.

v1.0.50

• Implement Eq for Value, Map, Number (#640, thanks @smarnach)

v1.0.49

• Improve error message when neither "std" nor "alloc" feature is enabled (#643)

Commits

• fd6741f Release 1.0.50
• 4ac9f6c Merge pull request #640 from smarnach/smarnach/eq-impls
• 99eb4ea Implement Eq for Map, Number and Value.
• 50656bd Release 1.0.49
• 4752793 Merge pull request #643 from serde-rs/nostd
• 8afacb9 Improve error message when neither std nor alloc is enabled
• da0a39f Provide optimized collect_str methods for Value serializer
• f59b637 Don't reallocate the string in serialize_char
• 665d1c5 Merge pull request #642 from serde-rs/sized
• 8db3954 Move ?Sized bounds out of generic parameter lists
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #83.