Use parallelStream for engine_getBlobsV2 proof serialisation, but not blobs

Signed-off-by: Simon Dudley <[email protected]>

Author: siladu

ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/engine/EngineGetBlobsV2.java

@@ -166,7 +166,7 @@ private VersionedHash[] extractVersionedHashes(final JsonRpcRequestContext reque
   private BlobAndProofV2 createBlobAndProofV2(final BlobProofBundle blobProofBundle) {
     return new BlobAndProofV2(
         HexUtils.toFastHex(blobProofBundle.getBlob().getData(), true),
-        blobProofBundle.getKzgProof().stream()
+        blobProofBundle.getKzgProof().parallelStream()
             .map(proof -> HexUtils.toFastHex(proof.getData(), true))
             .toList());
   }