def upgrade_schema_version(cls, data):
        """This overrides the "upgrade_schema_version" call in VersionedSchema (via
        ArtifactMixin) to modify the dictionary passed in from earlier versions of the manifest."""
        manifest_schema_version = get_artifact_schema_version(data)
        if manifest_schema_version < cls.dbt_schema_version.version:
            data = upgrade_manifest_json(data, manifest_schema_version)
        return cls.from_dict(data)
This overrides the "upgrade_schema_version" call in VersionedSchema (via
        ArtifactMixin) to modify the dictionary passed in from earlier versions of the manifest.
core/dbt/artifacts/schemas/manifest/v12/manifest.py