Use v2 of keepalive-workflow

[rfay]

keepalive-workflow@v2 is now available, which does not require the dummy commits every 2 months. Consider using it.

https://github.com/gautamkrishnar/keepalive-workflow/releases/tag/2.0.0

[rfay]

I guess this also requires a change to the permission statement, so perhaps we need a new major version of this action to support it?

[julienloizelet]

I guess this also requires a change to the permission statement, so perhaps we need a new major version of this action to support it?

Yes, from what I understand in the "migrating from v1 to v2" section, the user of our github action will have to modify the permission part accordingly in order to have a functional keepalive step.

I consider this is a breaking change and will create a "v2" major tag for the release.

[rfay]

I guess since users will have to change to @v2 and such, we'll gradually switch over and we'll have experience with it in case it doesn't work as advertised.