Add test cases for issue 4381

This was one of the original issues filed against rustfmt that discussed using a natural sort order instead of a lexicographical order. At the time it was closed, but now that we're supporting version-sorting in `style_edition=2024` I thought it would be good to add a test case.
rust-lang · Sep 3, 2024 · 4192118 · 4192118
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diff --git a/tests/source/issue-4381/style_edition_2015.rs b/tests/source/issue-4381/style_edition_2015.rs
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+// rustfmt-style_edition: 2015
+
+use std::num::{NonZeroU8, NonZeroU16, NonZeroU32, NonZeroU64};
diff --git a/tests/target/issue-4381/style_edition_2015.rs b/tests/target/issue-4381/style_edition_2015.rs
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+// rustfmt-style_edition: 2015
+
+use std::num::{NonZeroU16, NonZeroU32, NonZeroU64, NonZeroU8};
diff --git a/tests/target/issue-4381/style_edition_2024.rs b/tests/target/issue-4381/style_edition_2024.rs
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+// rustfmt-style_edition: 2024
+
+use std::num::{NonZeroU8, NonZeroU16, NonZeroU32, NonZeroU64};