Increase JSON-RPC limits, bump json-rpc

[arnetheduck]

• blocks can be bigger than the default 1mb when json-rpc-encoded - this happens on sepolia for example
• json-rpc bump improves debug logging and fixes a number of bugs
• json-serialization bump fixes a crash on invalid arrays in json data

At some point, it would probably be better to compute the maximum block size from actual block constraints, though this is somewhat tricky and depends on gas limits etc. Until then, 16mb should be plenty.

With this, sepolia can be synced :)