Potential fix for code scanning alert no. 284: Incorrect conversion between integer types

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: joel-rieke

sql/system_inttype.go

@@ -92,7 +92,10 @@ func (t systemIntType) Convert(v interface{}) (interface{}, error) {
 			return value, nil
 		}
 	case uint64:
-		return t.Convert(int64(value))
+		if value <= math.MaxInt64 {
+			return t.Convert(int64(value))
+		}
+		return nil, ErrInvalidSystemVariableValue.New(t.varName, v)
 	case float32:
 		return t.Convert(float64(value))
 	case float64: