Upgrade Dagger to latest version

bramble-android/build.gradle

bramble-android/witness.gradle

bramble-api/build.gradle

bramble-api/witness.gradle

bramble-core/build.gradle

bramble-core/witness.gradle

bramble-java/build.gradle

bramble-java/witness.gradle

briar-android/build.gradle

briar-android/witness.gradle

briar-core/build.gradle

briar-core/witness.gradle

briar-headless/build.gradle

briar-headless/witness.gradle