Fix version

Author: ValentaTomas

src/firecracker/swagger/firecracker.yaml

@@ -5,7 +5,7 @@ info:
     The API is accessible through HTTP calls on specific URLs
     carrying JSON modeled data.
     The transport medium is a Unix Domain Socket.
-  version: 1.12.2
+  version: 1.12.1
   termsOfService: ""
   contact:
     email: "firecracker-maintainers@amazon.com"