ci(build): Be like the cool kids and use uv

[crankynetman]

For now, let's just use the pip compatibility layer for uv.

https://docs.astral.sh/uv/pip/

[github-actions]

File	Coverage
All files	84%	✅
config/consumers.py	78%	✅
config/urls.py	69%	✅
config/settings/base.py	70%	✅
config/settings/local.py	73%	✅
scram/route_manager/admin.py	85%	✅
scram/route_manager/models.py	70%	✅
scram/route_manager/views.py	88%	✅
scram/route_manager/api/serializers.py	73%	✅
scram/route_manager/api/views.py	83%	✅
scram/templates/403.html	91%	✅
scram/templates/404.html	91%	✅
scram/templates/base.html	99%	✅

Minimum allowed coverage is 50%

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