Increase test timeout duration for RISC-V

[moui0]

Test fails on RISC-V because it is a very slow architecture: fix this by increasing the timeout on this specific test.

Error messages:

example.py:52: in main
    responses = gdbmi.write("-file-exec-and-symbols %s" % SAMPLE_C_BINARY)
pygdbmi/gdbcontroller.py:125: in write
    return self.io_manager.write(
pygdbmi/IoManager.py:284: in write
    return self.get_gdb_response(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <pygdbmi.IoManager.IoManager object at 0x3feb1bbe10>, timeout_sec = 1
raise_error_on_timeout = True

    def get_gdb_response(
        self,
        timeout_sec: float = DEFAULT_GDB_TIMEOUT_SEC,
        raise_error_on_timeout: bool = True,
    ) -> List[Dict]:
        """Get response from GDB, and block while doing so. If GDB does not have any response ready to be read
        by timeout_sec, an exception is raised.
    
        Args:
            timeout_sec: Maximum time to wait for reponse. Must be >= 0. Will return after
            raise_error_on_timeout: Whether an exception should be raised if no response was found after timeout_sec
    
        Returns:
            List of parsed GDB responses, returned from gdbmiparser.parse_response, with the
            additional key 'stream' which is either 'stdout' or 'stderr'
    
        Raises:
            GdbTimeoutError: if response is not received within timeout_sec
            ValueError: if select returned unexpected file number
        """
    
        if timeout_sec < 0:
            logger.warning("timeout_sec was negative, replacing with 0")
            timeout_sec = 0
    
        if USING_WINDOWS:
            retval = self._get_responses_windows(timeout_sec)
        else:
            retval = self._get_responses_unix(timeout_sec)
    
        if not retval and raise_error_on_timeout:
>           raise GdbTimeoutError(
                "Did not get response from gdb after %s seconds" % timeout_sec
            )
E           pygdbmi.constants.GdbTimeoutError: Did not get response from gdb after 1 seconds

pygdbmi/IoManager.py:104: GdbTimeoutError