Update Compose to v1.6.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
androidx.compose.material:material (source)	1.6.7 -> 1.6.8
androidx.compose.foundation:foundation (source)	1.6.7 -> 1.6.8
androidx.compose.ui:ui (source)	1.6.7 -> 1.6.8
androidx.compose.runtime:runtime (source)	1.6.7 -> 1.6.8

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