refs-openrpc.json is not being published via actions anymore

looks like it was removed here 6mo ago then never added back in all these reverts: 
https://github.com/ethereum/execution-apis/pull/653/files#diff-4f9e38227ed64fefb17f4668a7ac4ab55b6149994d5ac2fd96182d5958479b54L29-L33

This is pretty important for anyone consuming the spec.

Consuming a giant duplicated spec that might have circular deps will have issues with downstream tooling.