Update dependencies, target net9, and bump major version

Bump version number

Adds support for custom serialization and instantiation of objects sp…

…ecified by open generic types.

Fix a bug in serializing nullable value types that are not blittable …

…(classified as primitive). #178

Additional fixes for custom serialization

Bump version to 3

Merge branch 'master' of https://github.com/dbolin/Apex.Serialization

Fix a case where streams returning a variable number of bytes when re…

…ading from them could cause incorrect behavior

Projects used by tests are run in Debug config

update version