Update python-decouple requirement from ~=3.6 to ~=3.7

Updates the requirements on [python-decouple](https://github.com/henriquebastos/python-decouple) to permit the latest version.
- [Release notes](https://github.com/henriquebastos/python-decouple/releases)
- [Changelog](https://github.com/HBNetwork/python-decouple/blob/master/CHANGELOG.md)
- [Commits](HBNetwork/python-decouple@v3.6...v3.7)

---
updated-dependencies:
- dependency-name: python-decouple
  dependency-type: direct:production
...

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

requirements.txt

@@ -10,7 +10,7 @@ djangorestframework~=3.14.0
 git+https://github.com/Rurusetto/rurusetto-django-allauth.git
 django-colorfield~=0.7.2
 django-admin-interface~=0.22.2
-python-decouple~=3.6
+python-decouple~=3.7
 python-dateutil~=2.8.2
 boto3~=1.26.37
 django-storages~=1.13