Bump compose-ui from 1.6.7 to 1.6.8 (#345)

Bumps `compose-ui` from 1.6.7 to 1.6.8.

Updates `androidx.compose.ui:ui-tooling` from 1.6.7 to 1.6.8

Updates `androidx.compose.ui:ui-tooling-preview` from 1.6.7 to 1.6.8

---
updated-dependencies:
- dependency-name: androidx.compose.ui:ui-tooling
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: androidx.compose.ui:ui-tooling-preview
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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