Bump django-appointment from 3.6.3 to 3.6.4

Bumps [django-appointment](https://github.com/adamspd/django-appointment) from 3.6.3 to 3.6.4.
- [Release notes](https://github.com/adamspd/django-appointment/releases)
- [Commits](adamspd/django-appointment@v3.6.3...v3.6.4)

---
updated-dependencies:
- dependency-name: django-appointment
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 Django==5.0.7
 requests==2.32.3
 setuptools~=70.3.0
-django-appointment==3.6.3
+django-appointment==3.6.4
 django-dotenv==1.4.2