MINOR: Fix compiler warnings and add @nowarn for the unfixed ones #8490
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Also upgrade to scala-collection-compat 2.1.6 as it introduces the
@nowarn annotation.
Scala 2.13.2 (soon to be released) suppresses warnings with this
annotation.
While at it, also update scala-java8-compat to 0.9.1.
Committer Checklist (excluded from commit message)