sbt and scala library updates needed

[normana400]

looking at the current project, it is significantly behind on the latest scala and sbt libraries used in the build

sbt.version -> (current: 1.2.8, latest: 1.10.0)

crossScalaVersions:
2.13.x -> (current: 2.13.0, latest: 2.13.14)
2.12.x -> (current: 2.12.8, latest: 2.12.19)
2.11.x -> up to date
2.10.x -> up to date

dependencies:
scala-xml -> {current: 1.2.0, {latest: 2.3.0 (for 2.12 and higher), 1.3.1 (for 2.11)}}
scala-parser-combinators -> {current: 1.1.2 (for 2.12 and higher), 1.1.1 (for 2.11), latest: 2.4.0 (for 2.12 and higher), 1.1.1 (for 2.11)}

My proposal here is to update the project to the latest versions. The Scala-xml upgrade to 2.x is important since most other scala libraries have already ported to it (including scoverage).