Bump django-csp from 3.7 to 3.8

Bumps [django-csp](https://github.com/mozilla/django-csp) from 3.7 to 3.8.
- [Release notes](https://github.com/mozilla/django-csp/releases)
- [Changelog](https://github.com/mozilla/django-csp/blob/main/CHANGES)
- [Commits](mozilla/django-csp@3.7...3.8)

---
updated-dependencies:
- dependency-name: django-csp
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -80,7 +80,7 @@ django-autocomplete-light==3.9.7
     # via wagtail-inventory
 django-cors-headers==4.3.1
     # via -r requirements.in
-django-csp==3.7
+django-csp==3.8
     # via -r requirements.in
 django-environ==0.11.2
     # via -r requirements.in