Allow trailing ellipsis in `typing.TYPE_CHECKING` #25806

Job	Run time
cargo fmt	14s
pre-commit	24s
Determine changes	8s
mkdocs	1m 58s
python package	1m 11s
cargo clippy	1m 50s
cargo test (windows)	6m 23s
cargo fuzz	5m 16s
test scripts	52s
cargo test (linux)	4m 8s
cargo test (wasm)	1m 13s
benchmarks	4m 45s
cargo udeps	1m 57s
formatter instabilities and black similarity	0s
ecosystem	8m 29s
test ruff-lsp	13s
	39m 1s

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