chore: [WIP] 🍰 Upgrade Node Version

Created by: Tirokk

🍰 Pullrequest

Issues

• fixes #5175 (closed)
• relates #4081 (closed)
• relates #4082 (closed)

Additional Informations

If I use Node v14.20.0 or v16.16.0 in backend the tests are working with 2 GB memory.

We have increased to 8 GB now and it's working with Node v12.19.0, yet.

Todo

• a lot