Update dependency org.jetbrains.kotlinx:kotlinx-serialization-json to v1.2.2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlinx:kotlinx-serialization-json	1.2.1 -> 1.2.2

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Release Notes

Kotlin/kotlinx.serialization

v1.2.2

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This release contains various bugfixes, some useful features and important performance improvements.
It also uses Kotlin 1.5.20 as default.

Features

• Support for @JsonNames and coerceInputValues in Json.decodeFromDynamic (#​1479)
• Add factory function to wrap a serial descriptor with a custom name for custom delegating serializers (#​1547) (thanks to Fadenfire)
• Allow contextually serialized types to be used as map keys in Json (#​1552) (thanks to pdvrieze)

Bugfixes and performance improvements

• Update size in JsonStringBuilder slow-path to avoid excessive array-copies for large strings with escape symbols (#​1491)
• Optimize integer encoding length in CBOR (#​1570) (thanks to davertay)
• Throw JsonDecodingException instead of ClassCastException during unexpected null in TreeJsonDecoder (#​1550)
• Prohibit 'null' strings in lenient mode in order to get rid of 'null' and "null" ambiguity (#​1549)
• Avoid usage of reflective-like serialDescriptor<KType> in production sources (#​1540)
• Added correct error message when deserializing missing enum member for Properties format (#​1539)
• Make DescriptorSchemaCache in Json thread-local on Native (#​1484)

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