stop creating an MD5 hash

[bernhardreiter]

        "version": "v1.8.0",
        "hashes": [
          {
            "alg": "MD5",
            "content": "f1451a88dd6ced4acaa8f8e8c36608db"
          },

as https://en.wikipedia.org/wiki/MD5 is not collision resistant since a few years, it could only be used for indications of file transfer corruption. However cyclonedx-gomod is small enough that any other given hash is better suited.