[KYUUBI-SHADED #12] Pin flatten-maven-plugin 1.5.0

### _Why are the changes needed?_

### _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

- [ ] [Run test](https://kyuubi.readthedocs.io/en/master/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #12 from pan3793/flatten.

f7c09eb [Cheng Pan] Pin flatten-maven-plugin 1.5.0

Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: Cheng Pan <chengpan@apache.org>
1 file changed