rxjs subscribe deprecated - will be removed in v8

[FritzHerbers]

rxjs subscribe is deprecated and will be removed in v8, use separate callback arguments.

http-loader\config.http-loader.ts
  15:31  warning  'subscribe' is deprecated. Instead of passing separate callback arguments, use an observer argument. Signatures taking separate callback arguments will be removed in v8. Details: https://rxjs.dev/deprecations/subscribe-arguments  deprecation/deprecation

merge-loader\config.merge-loader.ts
  51:10  warning  'subscribe' is deprecated. Instead of passing separate callback arguments, use an observer argument. Signatures taking separate callback arguments will be removed in v8. Details: https://rxjs.dev/deprecations/subscribe-arguments  deprecation/deprecation

Further deprecation: throwError
merge-loader\config.merge-loader.ts
https://rxjs.dev/6-to-7-change-summary#throwerror