[flake8-bandit] Fix mixed-case hash algorithm names (S324) (#16552)

The PR solves issue #16525

Author: VascoSch92

crates/ruff_linter/resources/test/fixtures/flake8_bandit/S324.py

@@ -45,3 +45,10 @@
 crypt.mksalt()
 crypt.mksalt(crypt.METHOD_SHA256)
 crypt.mksalt(crypt.METHOD_SHA512)
+
+# From issue: https://github.com/astral-sh/ruff/issues/16525#issuecomment-2706188584
+# Errors
+hashlib.new("Md5")
+
+# OK
+hashlib.new('Sha256')

crates/ruff_linter/src/rules/flake8_bandit/rules/hashlib_insecure_hash_functions.rs

@@ -135,11 +135,11 @@ fn detect_insecure_hashlib_calls(
                 return;
             };
 
-            // `hashlib.new` accepts both lowercase and uppercase names for hash
+            // `hashlib.new` accepts mixed lowercase and uppercase names for hash
             // functions.
             if matches!(
-                hash_func_name,
-                "md4" | "md5" | "sha" | "sha1" | "MD4" | "MD5" | "SHA" | "SHA1"
+                hash_func_name.to_ascii_lowercase().as_str(),
+                "md4" | "md5" | "sha" | "sha1"
             ) {
                 checker.report_diagnostic(Diagnostic::new(
                     HashlibInsecureHashFunction {

crates/ruff_linter/src/rules/flake8_bandit/snapshots/ruff_linter__rules__flake8_bandit__tests__S324_S324.py.snap

@@ -195,3 +195,13 @@ S324.py:29:14: S324 Probable use of insecure hash functions in `crypt`: `crypt.M
 30 |
 31 | # OK
    |
+
+S324.py:51:13: S324 Probable use of insecure hash functions in `hashlib`: `Md5`
+   |
+49 | # From issue: https://github.com/astral-sh/ruff/issues/16525#issuecomment-2706188584
+50 | # Errors
+51 | hashlib.new("Md5")
+   |             ^^^^^ S324
+52 |
+53 | # OK
+   |