fix: resolve CI linting failures

depaudit/output/table_formatter.py

@@ -58,7 +58,6 @@ class TableFormatter(Formatter):
             lines.append("SEVERITY SUMMARY:")
             for severity, count in summary["severity_breakdown"].items():
                 if count > 0:
-                    color = SEVERITY_COLORS.get(severity, "grey")
                     lines.append(f"  {severity.upper()}: {count}")
 
         lines.append("")
@@ -67,8 +66,6 @@ class TableFormatter(Formatter):
         return "\n".join(lines)
 
     def _render_table(self, table: Table) -> str:
-        from io import StringIO
-        output = StringIO()
         self.console.begin_capture()
         self.console.print(table)
         captured = self.console.end_capture()