feat: update to actionslib v1.2.0, support self: (#1233)

Update to [actionslib v1.2.0](https://gitea.com/gitea/actionslib/releases/tag/v1.2.0) and move logic to it.

1. `self:{owner}/{repo}[/{path}]@{ref}` in step `uses` resolves on the runner's Gitea instance, for https://github.com/go-gitea/gitea/issues/38990.
2. `strategy.job-index` and `strategy.job-total` come from Gitea when it sends them.
3. Container, services and `with` are evaluated once instead of on every use.
4. Fixes a flaky clone-lock test.

Gitea PR: https://github.com/go-gitea/gitea/pull/39358
Docs PR: https://gitea.com/gitea/docs/pulls/553

---------

Co-authored-by: bircni <bircni@icloud.com>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1233
Reviewed-by: bircni <bircni@icloud.com>
Co-authored-by: silverwind <2021+silverwind@noreply.gitea.com>

go.sum

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