Continues the work started in https://github.com/digital-asset/daml/pull/12543
These libraries were only needed to transition from Scala 2.12 to 2.13
and are no longer useful as all the necessary items are now available
in Scala 2.13.
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New year, new copyright, new expected unknown issues with various files
that won't be covered by the script and/or will be but shouldn't change.
I'll do the details on Jan 1, but would appreciate this being
preapproved so I can actually get it merged by then.
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Was curious if there were any relevant performance improvements in
newer versions. Looks like the answer is no but we might as well
upgrade anyway.
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More dummy participant components, shared across the non-repudiation sub-tree.
These will also be used in client bindings tests.
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