chore(deps): update dependency django_csp to v3.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
django_csp (changelog)	==3.7 -> ==3.8

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Release Notes

mozilla/django-csp (django_csp)

v3.8

Compare Source

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Please note: this release folds in a number of fixups, upgrades and documentation tweaks,
but is functionally the same as 3.7. New features will come with 3.9+

• Update Python syntax for modern versions with pyupgrade
• Drop support for EOL Python <3.8 and Django <2.2 version; add support up to Django 5 on Python 3.12
• Switch to ruff instead of pep8 and flake8
• Move from CircleCI to Github Actions for CI
• Add support for using pre-commit with the project
• Remove deprecation warning for child-src
• Fix capturing brackets in script template tags
• Update docs to clarify when nonce will not be added to headers
• Move from setup.py and setup.cfg to pyproject.toml (#​209)

Note: identical other than release packaging to 3.8rc1

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