cargo-hack
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Improve testing for old cargo compatibility
We have some tests for it, but not enough.
Both of recent regressions (https://github.com/taiki-e/cargo-hack/commit/693f0c0d404d97346a54f4eee97fa6e34eeae84d, https://github.com/taiki-e/cargo-config2/commit/0a5870a0076e105e9c88d72991ab62e9793aaa1e) are caught by another repo's CI.