fix: use StrEnum type for GuestTokenResourceType to fix token parsing (…

…#30042)

superset/security/guest_token.py

@@ -14,20 +14,21 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
-from enum import Enum
 from typing import Optional, TypedDict, Union
 
 from flask_appbuilder.security.sqla.models import Role
 from flask_login import AnonymousUserMixin
 
+from superset.utils.backports import StrEnum
+
 
 class GuestTokenUser(TypedDict, total=False):
     username: str
     first_name: str
     last_name: str
 
 
-class GuestTokenResourceType(Enum):
+class GuestTokenResourceType(StrEnum):
     DASHBOARD = "dashboard"