build(deps): bump django in /.erda/migrations/core-services

Bumps [django](https://github.com/django/django) from 3.2.4 to 3.2.5.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/3.2.4...3.2.5

)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
...
Signed-off-by: dependabot[bot] <support@github.com>

.erda/migrations/core-services/requirements.txt

-Django==3.2.4
+Django==3.2.5
 mysqlclient==2.0.3
 pytz==2021.1
 sqlparse==0.4.1