Add support for scala 2.13.5 and update dependencies

[xBATx]

• remove support of Scala 2.10 as it's barely used nowadays.
• igrate also sbt plugins and other dependencies.
• increasing sbt version to 1.4.6

https://github.com/monix/shade/issues/66

[IIVat]

Hi, is there any chance to merge the changes soon? Desperately needed! 🙏

[mpilquist]

@alexandru Any chance of merging this and releasing a version for 2.13? Or maybe even adding a Scala 3 build?

[alexandru]

I wasn't aware there's still interest for Shade.

Sure, will do, soon.

[sbuzzard]

+1 on a 2.13 build

[scano-as24]

I'm also really interested in this change as it will allow us to upgrade a legacy project to Scala 2.13