feat: Add a workflow for updating vulnerable dependencies (npm audit fix)

[aimeerivers]

If vulnerabilities like this one are discovered in the packages we depend on, we would probably prefer to handle them quickly.

We would possibly want:

1. To check for vulnerabilities much more frequently (daily?)
2. To have it only update vulnerable packages (npm audit fix)
3. To release and deploy very quicly

[aimeerivers]

i think initially we might just want to add this to Update Please