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

[mnixry]

Summary

This PR updates the warning message for rule S305 to accurately reflect the security concern over using ECB mode in block ciphers, which is considered insecure compared to other modes like CBC or CTR. The previous message incorrectly mentioned AES as a block cipher mode, which has been corrected to avoid confusion.

Ref:
https://github.com/PyCQA/bandit/blob/c85576d903c213859634f4fbcb6304042442e62a/bandit/blacklists/calls.py#L99-L102

ruff/crates/ruff_linter/src/rules/flake8_bandit/rules/suspicious_function_call.rs

Lines 187 to 216 in 825fd7c

	/// ## What it does
	/// Checks for uses of weak or broken cryptographic cipher modes.
	///
	/// ## Why is this bad?
	/// Weak or broken cryptographic ciphers may be susceptible to attacks that
	/// allow an attacker to decrypt ciphertext without knowing the key or
	/// otherwise compromise the security of the cipher, such as forgeries.
	///
	/// Use strong, modern cryptographic ciphers instead of weak or broken ones.
	///
	/// ## Example
	/// ```python
	/// from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
	///
	/// algorithm = algorithms.ARC4(key)
	/// cipher = Cipher(algorithm, mode=modes.ECB(iv))
	/// encryptor = cipher.encryptor()
	/// ```
	///
	/// Use instead:
	/// ```python
	/// from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
	///
	/// algorithm = algorithms.ARC4(key)
	/// cipher = Cipher(algorithm, mode=modes.CTR(iv))
	/// encryptor = cipher.encryptor()
	/// ```
	///
	/// ## References
	/// - [Common Weakness Enumeration: CWE-327](https://cwe.mitre.org/data/definitions/327.html)

Test Plan

No testing required as the change is limited to a minor change of warning message update.

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

[charliermarsh]

Thanks, this looks right to me!