refactor(GH Actions): no install needed to deploy + updated Actions deps

[mountainash]

As this project has no packages to install, there's no need to run npm install in the Deploy process (and even if there was they aren't used in the deploy process).

I've updated the other 3rd Actions versions and remove some unnecessary envvar settings.

[adamschwartz]

This looks good, thanks. I’m a little reluctant to change the version of the wrangler action without a specific reason. How confident are you that this entire change won’t break anything if I merge it? (Would you be willing to make the revert if it did?)

[mountainash]

I've tested my deployment and it worked fine (but I used the new Wrangler Action; but I've compared the codebase of 1.2 against 2.0 and the changes seem to be for additional arguments that this project doesn't use).

I'm very confident it won't break anything.