Bump django from 4.2.16 to 4.2.18

Bumps [django](https://github.com/django/django) from 4.2.16 to 4.2.18.
- [Commits](django/django@4.2.16...4.2.18)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -5,7 +5,7 @@ bs4==0.0.1
 colorlog==3.1.4
 chardet==3.0.4
 crossrefapi==1.5.0
-Django==4.2.16
+Django==4.2.18
 django-bleach==3.1.0
 django-bootstrap4==23.2
 -e git+https://github.com/BirkbeckCTP/django-foundation-form.git@284fc5f08e58d8655c7301eddb49f920fda516d2#egg=foundationform