Bump navigation from 2.7.7 to 2.8.0 (#306)

Bumps `navigation` from 2.7.7 to 2.8.0.

Updates `androidx.navigation:navigation-fragment-ktx` from 2.7.7 to 2.8.0

Updates `androidx.navigation:navigation-testing` from 2.7.7 to 2.8.0

---
updated-dependencies:
- dependency-name: androidx.navigation:navigation-fragment-ktx
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: androidx.navigation:navigation-testing
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

gradle/libs.versions.toml

@@ -21,7 +21,7 @@ androidx-test-rules = "1.6.1"
 constraint = "2.1.4"
 tensorflow-lite = "2.16.1"
 tensorflow-support = "0.4.4"
-navigation = "2.7.7"
+navigation = "2.8.0"
 camera = "1.3.4"
 ktx = "1.13.1"
 material = "1.12.0"