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kotlinlang

i am trying to opt-in for `@ExperimentalTime`  in my multi-platform module - but the following doesnt work :
```sourceSets {
    all {
        languageSettings.optIn("kotlin.time.ExperimentalTime")
    }
}```
`languageSettings`  cant be found
```languageSettings.optIn("kotlin.time.ExperimentalTime")
                   ^ Unresolved reference: languageSettings```
anyine know what am i missing? this seems to be exactly as per the documentation page <https://kotlinlang.org/docs/opt-in-requirements.html#module-wide-opt-in>
i'm updating to  `1.6.10`