Recommend `project.requires-python` over `target-version` #21347

Job	Run time
cargo clippy	2m 17s
cargo test (linux)	5m 16s
Determine changes	11s
cargo fmt	15s
cargo fuzz	4m 26s
cargo test (windows)	12m 20s
cargo test (wasm)	1m 12s
cargo udeps	2m 2s
test scripts	1m 18s
benchmarks	10m 39s
mkdocs	2m 30s
pre-commit	1m 9s
python package	2m 1s
formatter instabilities and black similarity	0s
test ruff-lsp	15s
ecosystem	11m 21s
	57m 12s

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