Restrict backslash escape test to MySQL dialect

Backslash escapes are MySQL-specific, so the unterminated string
caused by a trailing backslash only fails tokenization in MySQL.

Author: hansott

aikido_zen/vulnerabilities/sql_injection/init_test.py

@@ -388,7 +388,7 @@ def test_lowercased_input_sql_injection():
 
 def test_block_invalid_sql_queries():
     # These are invalid queries (e.g. unterminated strings) that fail tokenization
-    is_sql_injection("SELECT * FROM users WHERE id = 'users\\'", "users\\")
+    is_sql_injection("SELECT * FROM users WHERE id = 'users\\'", "users\\", "mysql")
     is_sql_injection(
         "SELECT * FROM comments WHERE comment = 'I'm writting you'", "I'm writting you"
     )