fix(connector-fabric): runTransactionV1 Open API validation crash

The "express-openapi-validator" package was crashing while trying to
parse our Fabric connector's Open API spec because of the typo that
in the specs the "description" field for some schema elements were named
"properties" which is a reserved field in the schema of the specs.

Fixing the typo in the spec document made the problem go away.

Signed-off-by: Peter Somogyvari <peter.somogyvari@accenture.com>

packages/cactus-plugin-ledger-connector-fabric/src/main/json/openapi.json

@@ -123,11 +123,11 @@
           },
           "vaultTransitKey": {
             "$ref": "#/components/schemas/VaultTransitKey",
-            "properties": "vault key details , if Vault-X.509 identity provider to be used for singing fabric messages"
+            "description": "vault key details , if Vault-X.509 identity provider to be used for singing fabric messages"
           },
           "webSocketKey": {
             "$ref": "#/components/schemas/WebSocketKey",
-            "properties": "web-socket key details , if WS-X.509 identity provider to be used for singing fabric messages"
+            "description": "web-socket key details , if WS-X.509 identity provider to be used for singing fabric messages"
           }
         }
       },
@@ -878,6 +878,7 @@
             "items": {
               "$ref": "#/components/schemas/FileBase64"
             },
+            "type": "array",
             "minItems": 1,
             "maxItems": 65535,
             "nullable": false