## Issue Addressed
NA
## Proposed Changes
Reduces allocations by initializing the `pubkeys` vec to its final size. I doubt this will make a substantial difference, but it's nice to do it this way.
Seeing as `indexed_attestation.attesting_indices` has a [fixed length](e4b62139d7/consensus/types/src/indexed_attestation.rs (L22)), there's no real risk of a memory blow-up by pre-allocating the size of the `Vec`.
## Additional Info
NA