Use Python 3.12 for `fuzz-parser` in CI (#14159) #572

Job	Run time
Determine changes	9s
cargo fmt	19s
pre-commit	1m 5s
mkdocs	2m 30s
python package	1m 17s
cargo build (msrv)	4m 6s
cargo build (release)	5m 14s
cargo clippy	2m 4s
benchmarks	0s
cargo fuzz	5m 0s
cargo shear	27s
cargo test (linux)	4m 37s
cargo test (wasm)	1m 45s
cargo test (windows)	8m 31s
formatter instabilities and black similarity	4m 10s
test scripts	1m 7s
test ruff-lsp	37s
Fuzz the parser	6m 50s
ecosystem	0s
	49m 48s

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