Bump django-structlog from 6.0.1 to 7.1.0

Bumps [django-structlog](https://github.com/jrobichaud/django-structlog) from 6.0.1 to 7.1.0.
- [Changelog](https://github.com/jrobichaud/django-structlog/blob/main/docs/changelog.rst)
- [Commits](jrobichaud/django-structlog@6.0.1...7.1.0)

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

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

requirements.txt

@@ -3,7 +3,7 @@ Authlib==1.2.1
 certifi==2023.11.17
 cfgv==3.4.0
 Django==4.2.7
-django-structlog==6.0.1
+django-structlog==7.1.0
 django_extensions==3.2.3
 govuk-frontend-django==0.4.0
 gunicorn==21.2.0