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Bump up maven-download-plugin to 1.6.6

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [x] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests

) locally before make a pull request

Closes #965 from wangxuan0816/kyuubi-963.

Closes #963

291c367a [wangxuan0816] [KYUUBI #963] Bump up maven-download-plugin to 1.6.6
Authored-by: wangxuan0816 <1421615117@qq.com>
Signed-off-by: Cheng Pan <chengpan@apache.org>
(cherry picked from commit 682ec1c5

)
Signed-off-by: Cheng Pan <chengpan@apache.org>