Fix backslash escaping in SCRAM-SHA-256 password handling

Changed from excessive \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ (8 backslashes) to proper \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ (4 backslashes) for SQL escaping.
Each backslash in the original password is now correctly escaped as \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ (2 backslashes) in the result.

Co-authored-by: bmhughes <[email protected]>

Author: Copilot

libraries/sql/role.rb

@@ -68,7 +68,7 @@ def escape_password_for_sql(password)
           # SCRAM-SHA-256 passwords contain $ characters that can be interpreted
           # by shell or string processing. Escape them to prevent mangling.
           if password.start_with?('SCRAM-SHA-256')
-            password.gsub('\\', '\\\\\\\\').gsub("'", "''").gsub('$', '\\$')
+            password.gsub('\\', '\\\\').gsub("'", "''").gsub('$', '\\$')
           else
             password.gsub("'", "''")
           end