Jackson Release 2.12.3

Patch version of 2.12, released 12-Apr-2021.

Following fixes will be included in this patch release.

No changes since 2.12.2

#3108: TypeFactory cannot convert Collection sub-type without type parameters to canonical form and back

#259: Failed to handle case of alleged String with length of Integer.MAX_VALUE
#261: CBORParser need to validate zero-length byte[] for BigInteger
#269: CBOR loses Map entries with specific long Map key values (32-bit boundary)

#270: Ion Polymorphic deserialization in 2.12 breaks wrt use of Native Type Ids when upgrading from 2.8

#257: Uncaught validation problem wrt Smile BigDecimal type
#258: ArrayIndexOutOfBoundsException for malformed Smile header
#260: Allocate byte[] lazily for longer Smile binary data payloads
#263: Handle invalid chunked-binary-format length gracefully
#265: Allocate byte[] lazily for longer Smile binary data payloads
#266: ArrayIndexOutOfBoundsException in SmileParser._decodeShortUnicodeValue()
#268: Handle sequence of Smile header markers without recursion

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