Upgrade to Manifest 2.0

[vpuri3]

Getting this warning:

julia> using PkgTemplates                                                              

julia> t = Template(user="[email protected]")                                       
Template:                                                                              
...

julia> t("GraphSignalProcess")
[ Info: Running prehooks
[ Info: Running hooks
  Activating project at `~/.julia/dev/GraphSignalProcess`
    Updating registry at `~/.julia/registries/General.toml`
┌ Warning: The active manifest file at `/Users/vp/.julia/dev/GraphSignalProcess/Manifes
t.toml` has an old format that is being maintained.
│ To update to the new format, which is supported by Julia versions ≥ 1.6.2, run `Pkg.u
pgrade_manifest()` which will upgrade the format without re-resolving.
│ To then record the julia version re-resolve with `Pkg.resolve()` and if there are res
olve conflicts consider `Pkg.update()`.

[rroelz]

Had the same Warning Message today using interactive mode. Using Julia 1.8.3