CI: upgrade some actions

[github-actions[bot]]

Try this Pull Request!

Open Julia and type:

  julia> import Pkg
  julia> Pkg.activate(temp=true)
  julia> Pkg.add(url="https://github.com/DilumAluthge/Pluto.jl", rev="dpa/setup-julia-v2")
  julia> using Pluto

[fonsp]

Thanks!