Bump Django==5.2.9 to fix safety check

Updated Django version from 5.2.7 to 5.2.9.

Author: rhunwicks

requirements/base.txt

@@ -5,7 +5,7 @@ dagster_aws==0.27.7
 dagster-pipes==1.11.7
 dagster-postgres==0.27.7
 dagster-webserver==1.11.7
-Django==5.2.7
+Django==5.2.9
 django-binary-database-files==1.0.18
 django-cors-headers==4.9.0
 django-environ==0.11.2