improve support for sbt 1.5.0

[mcanlas]

No description provided.

[tuxji]

It would be very nice if someone could fix the CI, merge this PR, and release a new sbt-scoverage version so projects don't get SBT deprecated syntax warnings like this one anymore.

[info] Reapplying settings...
[info] set current project to daffodil (in build file:/home/runner/work/daffodil/daffodil/)
<set>:1: warning: method in in trait ScopingSetting is deprecated (since 1.5.0): `in` is deprecated; migrate to slash syntax - https://www.scala-sbt.org/1.x/docs/Migrating-from-sbt-013x.html#slash
coverageEnabled in ThisBuild := true
                ^
[info] Defining ThisBuild / coverageEnabled
[info] The new value will be used by Compile / compile / scalacOptions, daffodil-cli / Compile / compile / scalacOptions and 35 others.
[info] 	Run `last` for details.
[info] Reapplying settings...

[ckipp01]

Closing in favor of #324