nc-sa-2020-015.json: update 16.x comparison

Turns out, this was a typo, and this is already fixed in 16.0.9 by
nextcloud/server#19362.

See nextcloud/server#19976 for context.

Closes: nextcloud/server#19976

Author: flokli

server/nc-sa-2020-015.json

@@ -23,7 +23,7 @@
          "Operator":"<"
       },
       {
-         "Version":"16.0.10",
+         "Version":"16.0.9",
          "CVE":"CVE assignment pending",
          "Operator":"<"
       }