Bump version to 0.9.3 #39435

Job	Run time
Determine changes	9s
cargo fmt	23s
mkdocs	2m 31s
cargo build (release)	0s
pre-commit	3m 14s
python package	1m 27s
cargo clippy	1m 52s
cargo test (linux)	1m 48s
cargo test (linux, release)	3m 58s
cargo test (windows)	4m 17s
cargo build (msrv)	4m 12s
cargo fuzz build	5m 38s
cargo test (wasm)	1m 41s
cargo shear	21s
benchmarks	5m 15s
formatter instabilities and black similarity	3m 26s
test scripts	1m 9s
test ruff-lsp	49s
fuzz parser	5m 38s
ecosystem	4m 17s
	52m 5s

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