[`flake8-import-conventions`] Improve syntax check for aliases supplied in configuration for `unconventional-import-alias (ICN001)` #36698

Job	Run time
cargo fmt	18s
cargo build (release)	0s
mkdocs	2m 23s
Determine changes	9s
pre-commit	44s
python package	1m 30s
cargo clippy	1m 45s
cargo build (msrv)	3m 49s
benchmarks	4m 50s
cargo fuzz build	0s
cargo shear	22s
cargo test (linux)	1m 56s
cargo test (linux, release)	3m 34s
cargo test (wasm)	1m 43s
cargo test (windows)	2m 44s
test scripts	1m 2s
formatter instabilities and black similarity	0s
test ruff-lsp	41s
ecosystem	2m 40s
fuzz parser	0s
	30m 10s

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