Bump version to 0.6.9 #33632

Job	Run time
Determine changes	11s
cargo fmt	20s
pre-commit	40s
mkdocs	2m 54s
python package	1m 23s
cargo build (release)	5m 26s
cargo build (msrv)	3m 16s
benchmarks	5m 1s
cargo clippy	1m 56s
cargo fuzz	4m 42s
cargo shear	26s
cargo test (wasm)	1m 37s
cargo test (linux)	4m 10s
cargo test (windows)	6m 45s
test scripts	52s
formatter instabilities and black similarity	4m 16s
Fuzz the parser	5m 27s
ecosystem	15m 3s
test ruff-lsp	15s
	1h 4m 40s

Provide feedback