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Don't use `serde_json` to serialize a simple JSON object This avoids `rustc_data_structures` depending on `serde_json` which allows it to be compiled much earlier, unlocking most of rustc. This used to not matter, but after #110407 we're not blocked on fluent anymore, which means that it's now a blocking edge.  This saves a few more seconds. cc ````@Zoxc```` who added it recently