remove nvm and npm install step

.github/workflows/cache.yml

@@ -72,11 +72,6 @@ jobs:
 
             # don't restore the cache, otherwise we get artifacts left over from the previous run sit in the cache for eternity. Do a clean build every time.
 
-            - uses: actions/setup-node@v3
-              with:
-                  node-version-file: '.nvmrc'
-            - run: npm i -g "npm@$(jq -r .engines.npm < package.json)"
-
             - run: npm ci
 
             # install cypress so we don't have to do that every time