Upgrade pkg workflow to use latest Ploutos

[ximon18]

Currently the packaging workflow uses Ploutos @v1 while the latest is @v5.2.0.

Upgrading would resolve this warning currently being produced by Krill packaging workflow runs:

The set-output command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

It will likely also add more checks and speed improvements in the packaging process and simplify the inputs needed from Krill.

[ximon18]

Krill was since updated to use Ploutos v6, but the latest is v7 so this issue is actually still relevant.

[ximon18]

Upgrading to Ploutos v7 should fix #1184.

[ximon18]

A test run with Ploutos v7 failed but may just be because the version in the Krill Cargo.toml in the issue branch needs bumping.