Behavior when ARC Set exceeds 50

[simotuki11]

The following is about the verification process.

Verification is performed even if the ARC Set is 51.
We were expecting the verification result to be fail for 51 items, but the verification result was pass.

RFC8617 defines it as follows:
The maximum number of ARC Sets that can be attached to a message is 50. If more than the maximum number exist, the Chain Validation Status is "fail", and the algorithm stops here.

[flowerysong]

Fixed in flowerysong/OpenARC@2d45099