Update machine-api spec (#4241)

* YOYO NEW API SPEC!

* New machine-api types

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Jess Frazelle <jessfraz@users.noreply.github.com>

openapi/machine-api.json

@@ -107,6 +107,13 @@
             },
             "type": "array"
           },
+          "loaded_filament_idx": {
+            "description": "The currently loaded filament index.",
+            "format": "uint",
+            "minimum": 0,
+            "nullable": true,
+            "type": "integer"
+          },
           "nozzle_diameter": {
             "description": "Diameter of the extrusion nozzle, in mm.",
             "format": "double",
@@ -285,6 +292,21 @@
               "type"
             ],
             "type": "object"
+          },
+          {
+            "description": "Unknown material",
+            "properties": {
+              "type": {
+                "enum": [
+                  "unknown"
+                ],
+                "type": "string"
+              }
+            },
+            "required": [
+              "type"
+            ],
+            "type": "object"
           }
         ]
       },