OpenAPI spec has changed upstream

[github-actions]

The spec at https://api.ionq.co/v0.4/api-docs has diverged from the vendored openapi.json. Fetch the new spec and regenerate the client.

Diff (sorted, pretty-printed JSON)

--- vendored
+++ upstream
@@ -318,6 +318,56 @@
           "status": {
             "description": "Current status of the backend: `available`, `unavailable`, `retired`.",
             "type": "string"
+          },
+          "supported_error_mitigations": {
+            "description": "Error mitigation options supported by the backend.",
+            "example": [
+              "debiasing"
+            ],
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
+          "supported_gates": {
+            "description": "Gates supported by the backend.",
+            "example": [
+              "x",
+              "y",
+              "z",
+              "h",
+              "s",
+              "si",
+              "t",
+              "ti",
+              "v",
+              "vi",
+              "rx",
+              "ry",
+              "rz",
+              "cnot",
+              "swap",
+              "xx",
+              "yy",
+              "zz",
+              "not"
+            ],
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
+          },
+          "supported_native_gates": {
+            "description": "Native gates supported by the backend.",
+            "example": [
+              "gpi",
+              "gpi2",
+              "ms"
+            ],
+            "items": {
+              "type": "string"
+            },
+            "type": "array"
           }
         },
         "required": [