Remove generic E from RequestId (#6462)

* remove Ethspec from types where it's possible to do so

* remove generic E from RequestType

beacon_node/network/src/sync/network_context.rs

@@ -415,6 +415,7 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
                     request: RequestType::BlobsByRange(BlobsByRangeRequest {
                         start_slot: *request.start_slot(),
                         count: *request.count(),
+                        max_blobs_per_block: T::EthSpec::max_blobs_per_block(),
                     }),
                     request_id: AppRequestId::Sync(SyncRequestId::RangeBlockAndBlobs { id }),
                 })