Add X9.31 padding for RSA

Signed-off-by: Joachim Vandersmissen <git@jvdsn.com>

Author: jvdsn

schema/2.0/model/cyclonedx-cryptography-2.0.schema.json

@@ -289,6 +289,7 @@
                 "oaep",
                 "raw",
                 "pss",
+                "x931",
                 "other",
                 "unknown"
               ],
@@ -299,6 +300,7 @@
                 "oaep": "Optimal Asymmetric Encryption Padding for RSA.",
                 "raw": "No padding applied.",
                 "pss": "Probabilistic Signature Scheme for RSA signatures.",
+                "x931": "ANSI X9.31 padding for RSA.",
                 "other": "Another padding scheme.",
                 "unknown": "The padding scheme is not known."
               }