Add `SECURITY.md` #40746

Job	Run time
cargo fmt	17s
cargo build (release)	0s
mkdocs	2m 37s
Determine changes	13s
pre-commit	3m 19s
python package	1m 25s
cargo clippy	0s
benchmarks	0s
cargo build (msrv)	0s
cargo fuzz build	0s
cargo shear	0s
cargo test (linux)	0s
cargo test (linux, release)	0s
cargo test (wasm)	0s
cargo test (windows)	0s
formatter instabilities and black similarity	0s
test scripts	0s
fuzz parser	0s
ecosystem	0s
test ruff-lsp	0s
	7m 51s

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