* Pin 3rd party action
* Pin GitHub-maintained actions to tag
* Bump Bundlewatch Node.js to v14 LTS
I have no clue what my thought process was when creating this workflow
initially. Thrown this in here as it's a minor change and it's silly to
make a PR just to update this number, in my opinion.
* Install Prettier only, instead of all deps
* Allow running on workflow dispatch
Allows manually triggered CI runs by org members
* Update Node to latest LTS; update step descriptions
