Update secured-vc-with-schema-credential

[andresuribe87]

Once https://github.com/w3c/vc-json-schema/pull/204 is merged, the value of https://github.com/w3c/vc-jose-cose-test-suite/blob/main/testcases/secured-vc-with-schema-credential/schema.jwt has to be updated so that the payload of said JWT includes the credentialSchema property.

For simplicity, I'm providing the correct payload below:

{
  "@context": [
    "https://www.w3.org/ns/credentials/v2"
  ],
  "type": [
    "VerifiableCredential",
    "JsonSchemaCredential"
  ],
  "issuer": "https://vendor.example/issuers/42",
  "credentialSchema": {
    "id": "https://www.w3.org/2022/credentials/v2/json-schema-credential-schema.json",
    "type": "JsonSchema",
    "digestSRI": "sha384-S57yQDg1MTzF56Oi9DbSQ14u7jBy0RDdx0YbeV7shwhCS88G8SCXeFq82PafhCrW"
  },
  "credentialSubject": {
    "type": "JsonSchema",
    "jsonSchema": {
      "$id": "https://w3c.github.io/vc-jose-cose-test-suite/testcases/secured-vc-schema-credential/schema.json",
      "title": "Example JSON Schema",
      "description": "This is a test schema",
      "type": "object",
      "properties": {
        "credentialSubject": {
          "type": "object",
          "properties": {
            "id": {
              "type": "string",
              "pattern": "https://(.+)/issuers/(.+)"
            }
          }
        }
      }
    }
  }
}