Changing GitHub Actions to reflect the GitHub user + updating some references

[kallewesterling]

What I have done:

• Changed versions of referenced actions to be up-to-date (removes warnings in the GitHub actions tool)
• Changed the manually encoded secrets.GH_TOKEN to the automatic secrets.GITHUB_TOKEN
• Updated hard-coded references to seshat-global-history-databank/seshat to a variable ${{ github.actor }}/seshat instead, which allows for forks to run builds + tests automatically as well

[kallewesterling]

See conversation in #18

[edwardchalstrey1]

Quickly googling ERROR: denied: installation not allowed to Write organization package and the suggestion is to update these permissions to write-all as you already have done - so not sure there, but otherwise everything LGTM

[kallewesterling]

It's still not working, so I need to work more on this!

[edwardchalstrey1]

With this change do you think we even require a doc for #18 ? My original motivation was so any future developers knew how to change the token if I was not working on the project anymore, but that might no longer be an issue

[kallewesterling]

That's my hope!

[edwardchalstrey1]

@kallewesterling are you still working on this or should I take over?

Looks like where we left it it the write-all permission should have done the trick and we weren't sure why it didn't