Remove dj-database-url stubs (#10806)

stubs/dj-database-url/@tests/stubtest_allowlist.txt

@@ -1,2 +0,0 @@
-# Loop variable that leaks into the global namespace
-dj_database_url.key

stubs/dj-database-url/METADATA.toml

@@ -1,3 +0,0 @@
-version = "1.3.*"
-upstream_repository = "https://github.com/jazzband/dj-database-url"
-obsolete_since = "2.0.0" # Released on 2023-04-27

stubs/dj-database-url/dj_database_url.pyi

@@ -1,40 +0,0 @@
-from _typeshed import Incomplete
-from typing import Any
-from typing_extensions import TypedDict
-
-DEFAULT_ENV: str
-SCHEMES: dict[str, str]
-
-# From https://docs.djangoproject.com/en/4.0/ref/settings/#databases
-class DBConfig(TypedDict, total=False):
-    ATOMIC_REQUESTS: bool
-    AUTOCOMMIT: bool
-    CONN_MAX_AGE: int | None
-    DISABLE_SERVER_SIDE_CURSORS: bool
-    ENGINE: str
-    HOST: str
-    NAME: str
-    OPTIONS: dict[str, Any] | None
-    PASSWORD: str
-    PORT: str
-    TEST: dict[str, Any]
-    TIME_ZONE: str
-    USER: str
-
-def parse(
-    url: str,
-    engine: str | None = ...,
-    conn_max_age: int = ...,
-    conn_health_checks: bool = ...,
-    ssl_require: bool = ...,
-    test_options: dict[Incomplete, Incomplete] | None = ...,
-) -> DBConfig: ...
-def config(
-    env: str = ...,
-    default: str | None = ...,
-    engine: str | None = ...,
-    conn_max_age: int | None = ...,
-    conn_health_checks: bool = ...,
-    ssl_require: bool = ...,
-    test_options: dict[Incomplete, Incomplete] | None = ...,
-) -> DBConfig: ...