message: It's safe to respond to all for BlockHeadersBatch
diff: @@ -604,7 +604,7 @@ impl ItemFetcher<BlockHeader> for Fetcher<BlockHeader> {
  }
  impl ItemFetcher<BlockHeadersBatch> for Fetcher<BlockHeadersBatch> {
  - const SAFE_TO_RESPOND_TO_ALL: bool = false;
  + const SAFE_TO_RESPOND_TO_ALL: bool = true;
  fn responders(
  &mut self,
  