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

Bumps [django](https://github.com/django/django) from 3.1.12 to 3.1.13.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/3.1.12...3.1.13)

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

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

tests/apps/dockerfile-release/Pipfile.lock

@@ -34,11 +34,11 @@
         },
         "django": {
             "hashes": [
-                "sha256:a523d62b7ab2908f551dabc32b99017a86aa7784e32b761708e52be3dce6d35d",
-                "sha256:dc41bf07357f1f4810c1c555b685cb51f780b41e37892d6cc92b89789f2847e1"
+                "sha256:9f8be75646f62204320b195062b1d696ba28aa3d45ee72fb7c888ffaebc5bdb2",
+                "sha256:a6e0d1ff11095b7394c079ade7094c73b2dc3df4a7a373c9b58ed73b77a97feb"
             ],
             "index": "pypi",
-            "version": "==3.1.12"
+            "version": "==3.1.13"
         },
         "djangorestframework": {
             "hashes": [
@@ -106,7 +106,7 @@
                 "sha256:0c00730c74263a94e5a9919ade150dfc3b19c574389985446148402998287dae",
                 "sha256:48719e356bb8b42991bdbb1e8b83223757b93789c00910a616a071910ca4a64d"
             ],
-            "index": "pypi",
+            "markers": "python_version >= '3.5'",
             "version": "==0.4.2"
         },
         "whitenoise": {