Make system_fingerprint nullable

Author: karpetrosyan

openapi.yaml

@@ -21651,6 +21651,7 @@ components:
           $ref: "#/components/schemas/ServiceTier"
         system_fingerprint:
           type: string
+          nullable: true
           description: >
             This fingerprint represents the backend configuration that the model
             runs with.
@@ -21796,6 +21797,7 @@ components:
           $ref: "#/components/schemas/ServiceTier"
         system_fingerprint:
           type: string
+          nullable: true
           description: >
             This fingerprint represents the backend configuration that the model
             runs with.
@@ -22157,6 +22159,7 @@ components:
           description: The model used for completion.
         system_fingerprint:
           type: string
+          nullable: true
           description: >
             This fingerprint represents the backend configuration that the model
             runs with.