Fixing linter issue

Author: Ramón Argüelles-García

specification/mixedreality/resource-manager/Microsoft.MixedReality/stable/2021-01-01/common.json

@@ -31,6 +31,7 @@
       "properties": {
         "serial": {
           "type": "integer",
+          "format": "int32",
           "enum": [
             1,
             2