chore(deps): bump django in /tests/apps/dockerfile-release

Bumps [django](https://github.com/django/django) from 3.1.9 to 3.1.12.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/3.1.9...3.1.12)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

tests/apps/dockerfile-release/Pipfile.lock

@@ -21,6 +21,7 @@
                 "sha256:92906c611ce6c967347bbfea733f13d6313901d54dcca88195eaeb52b2a8e8ee",
                 "sha256:d1216dfbdfb63826470995d31caed36225dcaf34f182e0fa257a4dd9e86f1b78"
             ],
+            "markers": "python_version >= '3.6'",
             "version": "==3.3.4"
         },
         "dj-database-url": {
@@ -33,11 +34,11 @@
         },
         "django": {
             "hashes": [
-                "sha256:296d10092561a1cf16100885b935dc56cf09c8ccb114e64004554941677c6342",
-                "sha256:f5c3f1ce2473abf2f35d992c46d5534e53bd3397867689bde28fd29e856b46b7"
+                "sha256:a523d62b7ab2908f551dabc32b99017a86aa7784e32b761708e52be3dce6d35d",
+                "sha256:dc41bf07357f1f4810c1c555b685cb51f780b41e37892d6cc92b89789f2847e1"
             ],
             "index": "pypi",
-            "version": "==3.1.9"
+            "version": "==3.1.12"
         },
         "djangorestframework": {
             "hashes": [
@@ -105,6 +106,7 @@
                 "sha256:017cde379adbd6a1f15a61873f43e8274179378e95ef3fede90b5aa64d304ed0",
                 "sha256:0f91fd2e829c44362cbcfab3e9ae12e22badaa8a29ad5ff599f9ec109f0454e8"
             ],
+            "markers": "python_version >= '3.5'",
             "version": "==0.4.1"
         },
         "whitenoise": {