Fix keys ref in starknet_subscribeEvents

[franciszekjob]

This change is 

[ArielElp]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @franciszekjob)

[amanusk]

Can you please rebase this on top of latest v0.8.0, just so CI would pass :)

[ArielElp]

it's the updated validation script failing actually, no merge conflicts

[franciszekjob]

@ArielElp @amanusk yup, for some reason the validation fails. However, it's not related with the change, same CI fail happened in other PR from what I see.

[amanusk]

This PR: #235
Introduced a fix to the validation script and to the spec.
Since your PR was suggested before this fix was introduced, the CI is running on your codebase, and not the codebase after the merge.
There are no conflicts for merging, but the CI is still failing. The PR you linked failed for the same reason.

[ArielElp]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @franciszekjob)