beacon-api: `eth/v1/beacon/blob_sidecars` deprecated in favour of `eth/v1/beacon/blobs`

### Component

Anvil

### Describe the feature you would like

Just after addressing this #11797 by introducing a beacon REST API endpoint (`eth/v1/beacon/blob_sidecars`) #11972, it has been deprecated in favour of `eth/v1/beacon/blobs`.

I'll take care of this.

### Additional context

See: https://github.com/ethereum/beacon-APIs/pull/546 && https://github.com/alloy-rs/alloy/pull/2994