switch custom target JSON test to a less exotic target #3915
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We used to test an AVR target here, but while it is nice to test a 16bit target, it is also currently the case that rustc CI does not even check that libcore builds on a 16bit target -- and we don't want Miri to be in the game of maintaining that support. (See rust-lang/rust#130818.)
So let's use a tier 2 target as the basis for testing a custom JSON target.
(FWIW, we also test wasm32-wasip2 which is tier 3, but I expect it will become tier 2 Soon-ish.)