chore: chore: update Updatecli jsonschema (#2698)

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Co-authored-by: updateclibot[bot] <92153806+updateclibot[bot]@users.noreply.github.com>

Author: updateclibot[bot]

content/en/schema/latest/policy/manifest/config.json

@@ -7987,7 +7987,7 @@
                                     },
                                     "sourcebranch": {
                                         "type": "string",
-                                        "description": "\"sourcebranch\" defines the branch name used as a source to create the new Git branch.\n\ncompatible:\n * target\n\nremark:\n * sourcebranch is required when the scmid is not defined."
+                                        "description": "\"sourcebranch\" defines the branch name used as a source to create the new Git branch.\n\ncompatible:\n * target\n\nremark:\n * sourcebranch is required when the scmid is not defined.\n\ndefault: main"
                                     }
                                 },
                                 "additionalProperties": false,
@@ -16656,7 +16656,7 @@
                                     },
                                     "sourcebranch": {
                                         "type": "string",
-                                        "description": "\"sourcebranch\" defines the branch name used as a source to create the new Git branch.\n\ncompatible:\n * target\n\nremark:\n * sourcebranch is required when the scmid is not defined."
+                                        "description": "\"sourcebranch\" defines the branch name used as a source to create the new Git branch.\n\ncompatible:\n * target\n\nremark:\n * sourcebranch is required when the scmid is not defined.\n\ndefault: main"
                                     }
                                 },
                                 "additionalProperties": false,
@@ -25667,7 +25667,7 @@
                                     },
                                     "sourcebranch": {
                                         "type": "string",
-                                        "description": "\"sourcebranch\" defines the branch name used as a source to create the new Git branch.\n\ncompatible:\n * target\n\nremark:\n * sourcebranch is required when the scmid is not defined."
+                                        "description": "\"sourcebranch\" defines the branch name used as a source to create the new Git branch.\n\ncompatible:\n * target\n\nremark:\n * sourcebranch is required when the scmid is not defined.\n\ndefault: main"
                                     }
                                 },
                                 "additionalProperties": false,