Update GH Sync actions and migrate connected repos

The two GH sync actions (pull and deploy) need updating to use node 24 (which is the latest LTS)

This itself should be trivial - just bump the node version in the actions. Some other actions probably ought to be updated too.

We also need to change the in-repo actions so that they're not locked to a fix point release. Maybe bind to a minor, so that we can rollout fixes like this and auto-migrate.

The hardest bit is that that any connected repos will need a commit to update the local action to use the latest action version.

TODO list:

• Update node version on pull action
• Update node version on deploy action
• When generating actions for the repos, bind to the latest major version (not a fix point release)
• Verify that new actions work in a new release
• Manually migrate repos connected to all managed deployments - https://github.com/OpenFn/lightning/issues/4550
• Contact admins about any other repos (maybe we hand this off to services?)

Start by reviewing the GH sync pull and deploy actions and the action-generation path that binds connected repositories to an action version. Use issue #4550 to identify managed deployments, then migrate the connected repositories and contact administrators about any remaining repositories. Done means all applicable repositories use the updated action version and outstanding owners are contacted.