Issue template: Use bug label for Python API reports

Use the `Type/Bug` label by default for Python API docs since
the `Type/Report` label has been archieved.

Pull Request: https://projects.blender.org/blender/blender/pulls/126620

.gitea/issue_template/api_docs.yaml

@@ -1,7 +1,7 @@
 name: Python API Documentation
 about: File a bug report for the python API documentation
 labels:
-  - "Type/Report"
+  - "Type/Bug"
   - "Status/Needs Triage"
   - "Priority/Normal"
 body: