avro

Bump jackson.version from 2.11.4 to 2.12.1 in /lang/java

Bumps `jackson.version` from 2.11.4 to 2.12.1.

Updates `jackson-core` from 2.11.4 to 2.12.1
- [Release notes](https://github.com/FasterXML/jackson-core/releases)
- [Commits](https://github.com/FasterXML/jackson-core/compare/jackson-core-2.11.4...jackson-core-2.12.1)

Updates `jackson-databind` from 2.11.4 to 2.12.1
- [Release notes](https://github.com/FasterXML/jackson/releases)
- [Commits](https://github.com/FasterXML/jackson/commits)

Signed-off-by: dependabot[bot] <support@github.com>