Add stubs for django.contrib.postgres.expressions (#1765)

django-stubs/contrib/postgres/expressions.pyi

@@ -0,0 +1,14 @@
+from typing import Any
+
+from django.contrib.postgres.fields import ArrayField
+from django.db.models import Subquery
+from django.db.models.query import QuerySet
+from django.db.models.sql.query import Query
+from django.utils.functional import cached_property
+
+class ArraySubquery(Subquery):
+    template: str
+
+    def __init__(self, queryset: Query | QuerySet[Any], **kwargs: Any) -> None: ...
+    @cached_property
+    def output_field(self) -> ArrayField: ...

scripts/stubtest/allowlist.txt

@@ -163,6 +163,7 @@ django.contrib.gis.forms.BaseForm.changed_data
 django.contrib.gis.forms.BaseFormSet.forms
 django.contrib.gis.forms.BaseFormSet.management_form
 django.contrib.gis.forms.BoundField.subwidgets
+django.contrib.postgres.expressions.ArraySubquery.output_field
 django.core.files.File.size
 django.core.files.base.File.size
 django.core.files.storage.FileSystemStorage.base_location