chore(deps): bump django from 5.2.17 to 6.1.1 in /mailbox-app

Bumps [django](https://github.com/django/django) from 5.2.17 to 6.1.1.
- [Commits](django/django@5.2.17...6.1.1)

---
updated-dependencies:
- dependency-name: django
  dependency-version: 6.1.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

mailbox-app/pyproject.toml

@@ -27,7 +27,7 @@ requires-python = ">=3.12,<3.13"
 license = "AGPL-3.0-or-later"
 readme = "README.md"
 dependencies = [
-  "Django==5.2.17",
+  "Django==6.1.1",
   "argon2-cffi==25.1.0",
   "bleach==6.4.0",
   "tinycss2==1.5.1",

mailbox-app/requirements/base.txt

@@ -1,4 +1,4 @@
-Django==5.2.17
+Django==6.1.1
 argon2-cffi==25.1.0
 bleach==6.4.0
 filelock==3.20.3

mailbox-app/requirements/constraints.txt

@@ -6,7 +6,7 @@ bandit==1.9.4
 bleach==6.4.0
 cffi==2.0.0
 coverage==7.13.3
-Django==5.2.17
+Django==6.1.1
 filelock==3.20.3
 gunicorn==25.1.0
 packaging==26.2

mailbox-app/requirements/locked.txt

@@ -4,7 +4,7 @@ argon2-cffi-bindings==25.1.0
 asgiref==3.11.1
 bleach==6.4.0
 cffi==2.0.0
-Django==5.2.17
+Django==6.1.1
 filelock==3.20.3
 gunicorn==25.1.0
 packaging==26.2