Bump androidx.compose.ui:ui-test-manifest from 1.6.7 to 1.6.8

Bumps androidx.compose.ui:ui-test-manifest from 1.6.7 to 1.6.8.

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

Signed-off-by: dependabot[bot] <support@github.com>

gradle/libs.versions.toml

@@ -24,7 +24,7 @@ napier = "2.7.1"
 mokoResources = "0.24.0"
 materialThemePrefs = "0.8.3"
 androidxActivityCompose = "1.9.0"
-androidxComposeTest = "1.6.7"
+androidxComposeTest = "1.6.8"
 androidxCoreSplashscreen = "1.0.1"
 androidxLegacySupport = "1.0.0"
 androidxPreference = "1.2.1"