Remove django-mongodb-backend from django-thirdparty group

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: aclark4life

src/dbx_python_cli/config.toml

@@ -216,7 +216,6 @@ bakerydemo = true
 # Python version for the group's virtual environment
 python_version = "3.13"
 repos = [
-    "git@github.com:mongodb-labs/django-mongodb-backend.git",
     "git@github.com:pennersr/django-allauth.git",
     "git@github.com:encode/django-rest-framework.git",
     "git@github.com:jazzband/django-taggit.git",