Support sublibraries as dependencies

I see failures to build `io-sim` with the following error on the hackage server:
```
Configuring io-sim-1.9.1.0...
Error: cabal: Encountered missing or private dependencies:
io-classes:{io-classes, si-timers, strict-stm} ==1.9.0.0
```
Full build report is available [here](https://hackage.haskell.org/package/io-sim-1.9.1.0/reports/2).

Locally `io-sim` builds fine with `cabal` (after a clean `cabal get io-sim-1.9.1.0`). It also builds with GitHub actions, [ref](https://github.com/input-output-hk/io-sim/commits/io-sim-1.9.1.0/)). I use `cabal-3.14.2.0` and the same version is used by the GitHub actions.