Update warning message for rule S305 to address insecure block cipher mode use #26216

Job	Run time
pre-commit	35s
mkdocs	2m 7s
cargo fmt	19s
Determine changes	9s
python package	1m 16s
cargo clippy	1m 56s
benchmarks	4m 13s
cargo fuzz	4m 34s
cargo test (linux)	3m 39s
cargo test (wasm)	1m 13s
cargo test (windows)	6m 25s
cargo udeps	1m 59s
test scripts	52s
formatter instabilities and black similarity	0s
ecosystem	8m 40s
test ruff-lsp	18s
	38m 15s

Provide feedback