[guppy] update cfg-expr + fixtures #1375

Job	Run time
Build and test (all features) (ubuntu-latest, 1.78)	1m 58s
Build and test core crates (ubuntu-latest, 1.78)	1m 48s
Build and test (all features) (ubuntu-latest, stable)	1m 49s
Build and test core crates (ubuntu-latest, stable)	1m 42s
Build and test (all features) (macos-14, 1.78)	1m 52s
Build and test (all features) (macos-14, stable)	1m 53s
Build and test core crates (macos-14, 1.78)	1m 44s
Build and test (all features) (windows-latest, 1.78)	1m 45s
Build and test core crates (macos-14, stable)	1m 38s
Build and test (all features) (windows-latest, stable)	1m 44s
Build and test core crates (windows-latest, 1.78)	1m 43s
Build documentation (ubuntu-latest)	54s
Build and test core crates (windows-latest, stable)	1m 44s
Lint	1m 17s
cargo-compare extended tests (ubuntu-latest)	44s
Cross-compile to aarch64	1m 33s
cargo-compare extended tests (macos-14)	48s
	26m 36s

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