[Version mismatch] 'get()' is only available in iOS 15 or newer

[lmcmz]

Describe the bug

It seem like there is a version mismatch issue in the latest v1.8.0 version, build as the project was fine.
But when I import it to my own project, it throws other errors, I can see those 2 places iOS version is not consistent.

Here is the version info:
gRPC-swift version 1.8.0
Xcode version 14-beta

To reproduce

Steps to reproduce the bug you've found:

1. Import the lib from SPM
2. Build the project

Screenshots

[Lukasa]

Please update your package dependency versions: NIO lowered the availability requirement for EventLoopFuture.get in 2.36.0.