[core] Upgrade flatbuffer (Mar.15, 2025)

[dentiny]

Description

At the moment, our flatbuffer is at a pretty stale version (see git commit below), which is 6 years below the latest version. We should definitely upgrade to the later versions.

[~/flatbuffers] (master) 
ubuntu@hjiang-devbox-pg$ git log
commit 63d51afd1196336a7d1f56a988091ef05deb1c62 (HEAD -> master)
Author: Vlad Frolov <frolvlad@gmail.com>
Date:   Thu Jan 17 21:56:52 2019 +0200

    [docs] [rust] Add "Useful tools created by others" section (#5127)

Use case

No response