[client] add sshkey properties for stix export

Author: ValentinBouzinFiligran

pycti/entities/stix_cyber_observable/opencti_stix_cyber_observable_properties.py

@@ -173,6 +173,16 @@
           algorithm
           hash
         }
+    }
+     ... on SSHKey {
+        key_type
+        public_key
+        fingerprint_sha256
+        fingerprint_md5
+        key_length
+        expiration_date
+        comment
+        created
     }
     ... on IPv4Addr {
         value
@@ -479,6 +489,16 @@
           hash
         }
     }
+    ... on SSHKey {
+        key_type
+        public_key
+        fingerprint_sha256
+        fingerprint_md5
+        key_length
+        expiration_date
+        comment
+        created
+    }
     ... on IPv4Addr {
         value
     }