[bun] Huge process_heap_bytes running beacon-node

[twoeths]

Describe the bug

this could be the reason why a lot of times the p2p req/resp failed with TIMED_OUT error and node cannot proceed (will separate to a separate issue if process_heap_bytes is not the root cause)

Expected behavior

the same process_heap_bytes like on unstable/NodeJS branch (~9GB on nogroup nodes)

Steps to reproduce

No response

Additional context

No response

Operating system

Linux

Lodestar version or commit hash

cayman/bun