Use Avaje Jsonb for Javalin JSON

[thatcomputerguy0101]

Description

This updates to the release version of Avaje Jsonb and switches Javalin to use Avaje Jsonb as its backend to fix some serialization bugs. No tests are written since no tests are set up for photon-server, but there probably should be to catch problems like this.

Meta

Merge checklist:

• Pull Request title is short, imperative summary of proposed changes
• The description documents the what and why, including events that led to this PR
• If this PR changes behavior or adds a feature, user documentation is updated
• If this PR touches photon-serde, all messages have been regenerated and hashes have not changed unexpectedly
• If this PR touches configuration, this is backwards compatible with all settings going back to the previous seasons's last release (seasons end after champs ends)
• If this PR touches pipeline settings or anything related to data exchange, the frontend typing is updated
• If this PR addresses a bug, a regression test for it is added
• If this PR adds a dependency, the license has been checked for compatibility and steps taken to follow it

[mcm001]

Let's definitely scope tests for future work, focusing on high reward/low effort options