remove unnecessary dockerfile ssl option

ee/docker/ee.Dockerfile

@@ -47,9 +47,6 @@ RUN npm i
 
 ENV NODE_ENV=production
 
-# TODO: remove this, but gets around https://github.com/webpack/webpack/issues/14532 for now
-ENV NODE_OPTIONS=--openssl-legacy-provider
-
 RUN npm run build
 
 # Deployment environment