Allow space-before-colon after end-of-slice #22010

Job	Run time
cargo fuzz	3m 42s
cargo clippy	2m 8s
benchmarks	9m 33s
cargo fmt	16s
cargo test (linux)	3m 42s
cargo test (wasm)	1m 22s
cargo udeps	1m 54s
cargo test (windows)	4m 40s
Determine changes	7s
mkdocs	2m 7s
pre-commit	23s
python package	1m 9s
test scripts	54s
formatter instabilities and black similarity	0s
test ruff-lsp	16s
ecosystem	7m 38s
	39m 51s

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