Update dependency django_select2 to v8

This MR contains the following updates:

Package	Type	Update	Change
django_select2 (changelog)	dependencies	major	^7.1 -> ^8.0

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Release Notes

codingjoe/django-select2

v8.0.0

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What's Changed

• Add selenium test marker to stabilize CI suite by @​codingjoe in https://github.com/codingjoe/django-select2/pull/165
• Replace fussyfox with GH actions by @​codingjoe in https://github.com/codingjoe/django-select2/pull/166
• Fix #​163 -- Lazily get i18n locale name by @​codingjoe in https://github.com/codingjoe/django-select2/pull/164
• Update packaging to pyproject.toml by @​codingjoe in https://github.com/codingjoe/django-select2/pull/167
• Fix Select2AdminMixin by @​codingjoe in https://github.com/codingjoe/django-select2/pull/168
• Change default Select2 version to Django's vendored version by @​codingjoe in https://github.com/codingjoe/django-select2/pull/169

Full Changelog: https://github.com/codingjoe/django-select2/compare/7.11.1...8.0.0

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