Bump versions to Spark 2.4.5 and Scala 2.11.12. (#8676)
Bump versions to Spark 2.4.5 and Scala 2.11.12. (#8676)

* Bump versions to Spark 2.4.5 and Scala 2.11.12.

The logic trying to infer the version of various Spark dependencies
was total garbage and almost certainly except for a few specific
cases.  I was feeling aggressive.  I nuked it.  If we want to support
building with other versions of Spark reliably (whcih we don't test)`,
we should find another way.

* bump
cseed/hail,cseed/hail,hail-is/hail,cseed/hail,danking/hail,hail-is/hail,hail-is/hail,hail-is/hail,hail-is/hail,danking/hail,danking/hail,cseed/hail,danking/hail,cseed/hail,danking/hail,cseed/hail,danking/hail,danking/hail,cseed/hail,hail-is/hail,cseed/hail,hail-is/hail,hail-is/hail,danking/hail