Missing dependencies from yarn

Hi, 

when trying to install a new Symfony demo app on Platform.sh, using: 
```
symfony new symfony-demo --demo --cloud
cd symfony-demo
symfony cloud:create
symfony deploy
```
i get this error during PSH deploy 

```
yarn run v1.22.19
          $ /app/node_modules/.bin/encore production
          W: node:internal/modules/cjs/loader:998
          W:   throw err;
          W:   ^
          W: Error: Cannot find module '@babel/core'
```

When running yarn install, some dependencies are missing so i needed to add them into package.json for deployment to success
```
yarn install v1.22.18
[1/4] 🔍  Resolving packages...
[2/4] 🚚  Fetching packages...
[3/4] 🔗  Linking dependencies...
warning " > @symfony/[email protected]" has unmet peer dependency "@hotwired/stimulus@^3.0".
warning "@symfony/stimulus-bridge > @hotwired/[email protected]" has unmet peer dependency "@hotwired/stimulus@>= 3.0".
warning " > @symfony/[email protected]" has unmet peer dependency "@babel/core@^7.17.0".
warning " > @symfony/[email protected]" has unmet peer dependency "@babel/preset-env@^7.16.0".
warning " > @symfony/[email protected]" has unmet peer dependency "webpack@^5.72".
warning " > @symfony/[email protected]" has unmet peer dependency "webpack-cli@^4.9.1".
warning "@symfony/webpack-encore > @nuxt/[email protected]" has unmet peer dependency "webpack@^2.0.0 || ^3.0.0 || ^4.0.0 || ^5.0.0".
warning "@symfony/webpack-encore > [email protected]" has unmet peer dependency "webpack@>=5.0.0".
warning "@symfony/webpack-encore > [email protected]" has unmet peer dependency "@babel/core@^7.0.0".
warning "@symfony/webpack-encore > [email protected]" has unmet peer dependency "webpack@>=2".
warning "@symfony/webpack-encore > [email protected]" has unmet peer dependency "webpack@>=4.0.0 <6.0.0".
warning "@symfony/webpack-encore > [email protected]" has unmet peer dependency "webpack@^5.0.0".
warning "@symfony/webpack-encore > [email protected]" has unmet peer dependency "webpack@^5.0.0".
warning "@symfony/webpack-encore > [email protected]" has unmet peer dependency "webpack@^5.0.0".
warning "@symfony/webpack-encore > [email protected]" has unmet peer dependency "webpack@^5.0.0".
warning "@symfony/webpack-encore > [email protected]" has unmet peer dependency "webpack@^5.1.0".
warning "@symfony/webpack-encore > [email protected]" has unmet peer dependency "webpack@^4.37.0 || ^5.0.0".
warning "@symfony/webpack-encore > webpack-dev-server > [email protected]" has unmet peer dependency "webpack@^4.0.0 || ^5.0.0".
warning " > [email protected]" has unmet peer dependency "bootstrap@^3.3".
warning " > [email protected]" has unmet peer dependency "moment@^2.10".
warning " > [email protected]" has unmet peer dependency "moment-timezone@^0.4.0 || ^0.5.0".
warning " > [email protected]" has unmet peer dependency "webpack@^5.0.0".
```

And upgrading sass-loader to version 13 as well to avoid having this warning during PSH deploy: 
```
           WARNING  Webpack Encore requires version ^13.0.0 of sass-loader, but your version (12.6.0) is too old. The related feature will probably *not* work correctly.
```

hope it helps.

Author: flovntp

package.json

@@ -15,10 +15,18 @@
         "lato-font": "^3.0.0",
         "regenerator-runtime": "^0.13.2",
         "sass": "^1.53.0",
-        "sass-loader": "^12.3",
+        "sass-loader": "^13.2",
         "stimulus": "^2.0.0",
         "typeahead.js": "^0.11.1",
         "webpack-notifier": "^1.15.0"
+        "@babel/core": "^7.20.5",
+        "@babel/preset-env": "^7.16.0",
+        "@hotwired/stimulus": "^3.0",
+        "bootstrap": "^3.3",
+        "moment": "^2.10",
+        "moment-timezone": "^0.5.40",
+        "webpack": "^5.72",
+        "webpack-cli": "^4.9.1"
     },
     "license": "MIT",
     "private": true,