Move faker to devDependencies

[Scorpil]

Description

Describe your PR! If it fixes specific issue, mention it with "Fixes # (issue)".

Moved faker to devDependencies and updated to the latest version. Although the new version introduces quite a few breaking changes, our usage is simple enough that no additional adjustments were necessary.

Fixes #436

Contributor Checklist

Make sure to do the following steps if they are applicable to your PR:

• Update e2e tests: If you changed the /template/app, then make sure to do any neccessary updates to /template/e2e-tests also.
• Update demo app: If you changed the /template/app, then make sure to do any neccessary updates to /opensaas-sh/app_diff also. Check /opensaas-sh/README.md for details.
• Update docs: If needed, update the /opensaas-sh/blog/src/content/docs.

[vincanger]

Hey thanks @Scorpil for the PR. I had to take care of this when working on another issue so it's already been merged. :)