Update devDependencies to latest versions

Updates:
- cypress v4.9.0
- jest v26.1.0
- nelify-cli v2.54.0
- wait-on v5.0.1

Author: FinnWoelm

README.md

@@ -90,7 +90,7 @@ I recommend you still use `next dev` to build and preview your application local
 
 But if you want to emulate the Netlify deployment on your computer, you can also run `next-on-netlify` locally and then use `netlify-cli` to preview the result.
 
-First, install `netlify-cli` v2.51.0 or later:
+First, install `netlify-cli` v2.54.0 or later:
 
 ```bash
 npm install -g netlify-cli