fix: unresolved import `"syn::ItemFn"` when running tests #1036

Job	Run time
Generic pre-commit checks	19s
Clippy	45s
Run test coverage	4m 36s
Build on wasm32-unknown-unknown	31s
Check features	1m 1s
Rustfmt	10s
Python 3.7 on ubuntu-20.04	2m 11s
Verify commit messages	44s
Python 3.8 on ubuntu-20.04	1m 50s
Python 3.9 on ubuntu-20.04	2m 3s
Test draft201909 (stable) on ubuntu-20.04	1m 17s
Python 3.10 on ubuntu-20.04	1m 58s
Test draft202012 (stable) on ubuntu-20.04	1m 10s
Python 3.11 on ubuntu-20.04	1m 45s
Test draft201909 (stable) on macos-12	1m 44s
Python 3.7 on macos-12	6m 49s
Test draft202012 (stable) on macos-12	2m 57s
Test draft201909 (stable) on windows-2022	3m 10s
Python 3.8 on macos-12	5m 52s
Python 3.9 on macos-12	2m 38s
Test draft202012 (stable) on windows-2022	3m 8s
Python 3.10 on macos-12	2m 42s
Python 3.11 on macos-12	4m 34s
Python 3.7 on windows-2022	4m 39s
Python 3.8 on windows-2022	4m 43s
Python 3.9 on windows-2022	4m 34s
Python 3.10 on windows-2022	5m 18s
Python 3.11 on windows-2022	4m 1s
	1h 17m 9s

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