Update to latest spec tests

[realbigsean]

unstable is currently on alpha.8
https://github.com/ethereum/consensus-specs/releases/tag/v1.5.0-alpha.10
https://github.com/ethereum/consensus-specs/releases/tag/v1.5.0-alpha.9

[jimmygchen]

I'm working on updating the PeerDAS tests as part of #6709.

[michaelsproul]

I think @pawanjay176 is working on the Electra changes

[michaelsproul]

I've started on the consensus code while Pawan works on the engine changes

• Electra spec changes for v1.5.0-beta.0 #6731

[michaelsproul]

The Electra side of this is done. Just waiting on this PR for PeerDAS tests:

• Implement PeerDAS Fulu fork activation #6795