Use Gradle with --offline when building the browser part
boklm noticed in comment:23:ticket:27977 that we are using Gradle's
--offline mode for building Orbot which fails hard if the dependencies are not available (at least it seems so; I have not checked). Furthermore, he suggested we use that mode as well for the Firefox build part. This seems like a good defense in depth given bugs like #28752 (moved).
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