Bump libs/scala-cli. Fix deprecation.

[carlosedp]

Bump libs and scala-cli.

Fix deprecation:

[warn] ./src/Index.scala:142:33
[warn] The syntax `x: _*` is no longer supported for vararg splices; use `x*` instead
[warn] This construct can be rewritten automatically under -rewrite -source 3.4-migration.
[warn]       ujson.Obj(l.head, l.tail: _*)
...

[ckipp01]

Thanks @carlosedp!