Support for RxJs 8+ (when it releases)

[NikolaPeevski]

I'm submitting a...

[ ] Regression 
[ ] Bug report
[ ] Feature request
[ ] Documentation issue or request
[x] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

Currently there are left out todos about the migration of the following deprecated functions:

• toPromise (ref: https://rxjs.dev/deprecations/to-promise)
• retryWhen (ref: https://rxjs.dev/api/index/function/retryWhen#deprecation-notes)

These will, inevitably, cause hurdles when (if, haha) RxJS gets to version 8. As the migrations are fairly straightforward it's best to be up to date on RxJS's future plans and support.

Expected behavior

Be compat with the future library releases

Minimal reproduction of the problem with instructions

N/A

What is the motivation / use case for changing the behavior?

Be compat with the future library releases

Environment

Nest version: X.Y.Z

 
For Tooling issues:
- Node version: XX  
- Platform:  

Others:

CC: @kamilmysliwiec @manekinekko