[hail] remove repo.spring.io, which we was added to support hortonworks spark (#10567)
[hail] remove repo.spring.io, which we was added to support hortonworks spark (#10567)

See [discussion](https://hail.zulipchat.com/#narrow/stream/127527-team/topic/CI.20Deploy.20Failure/near/241944633). spring.io no
longer supports [direct, unauthenticated access to its repository](https://spring.io/blog/2020/10/29/notice-of-permissions-changes-to-repo-spring-io-fall-and-winter-2020).
hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail