The workflow run at
https://github.com/zed-industries/zed/actions/runs/23557683707 succeeded
but threw some warnings for a rather-soon Node.js 20 deprecation (June
2nd).

Hence, this PR updates in that context mentioned workflows to newer
versions from which on the actions will use Node.js 24.

Namely, this updates
- `actions/checkout`
- `actions/create-github-app-token` and
- `peter-evans/create-pull-request`

to their latest version which includes said updates. As for their most
recent versions, all of these actions just updated their versions to
account for said deprecation.

Release Notes:

- N/A