chore(deps): bump gunicorn from 25.1.0 to 26.0.0 in /mailbox-app

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 25.1.0 to 26.0.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@25.1.0...26.0.0)

---
updated-dependencies:
- dependency-name: gunicorn
  dependency-version: 26.0.0
  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

@@ -31,7 +31,7 @@ dependencies = [
   "argon2-cffi==25.1.0",
   "bleach==6.4.0",
   "filelock==3.20.3",
-  "gunicorn==25.1.0",
+  "gunicorn==26.0.0",
   "mysqlclient==2.2.7",
   "python-dotenv==1.2.2",
   "whitenoise==6.11.0",

mailbox-app/requirements/base.txt

@@ -2,7 +2,7 @@ Django==5.2.16
 argon2-cffi==25.1.0
 bleach==6.4.0
 filelock==3.20.3
-gunicorn==25.1.0
+gunicorn==26.0.0
 python-dotenv==1.2.2
 whitenoise==6.11.0
 

mailbox-app/requirements/constraints.txt

@@ -8,7 +8,7 @@ cffi==2.0.0
 coverage==7.13.3
 Django==5.2.16
 filelock==3.20.3
-gunicorn==25.1.0
+gunicorn==26.0.0
 packaging==26.2
 pip-audit==2.10.0
 pycparser==3.0

mailbox-app/requirements/locked.txt

@@ -6,7 +6,7 @@ bleach==6.4.0
 cffi==2.0.0
 Django==5.2.16
 filelock==3.20.3
-gunicorn==25.1.0
+gunicorn==26.0.0
 packaging==26.2
 pycparser==3.0
 python-dotenv==1.2.2