This is needed with the move to `deps.edn` for tracking all
dependencies, since it makes shadow-cljs rely on the `clojure`
binary.

* Updating actions

* [ci noskip] Changing ubuntu to latest lts as default

* [ci noskip] Fix typo

To avoid double runs of various checks (linters, tests, etc) on feature
branch, we mainly run on pull_request trigger, i.e. the checks are
carried out once that feature branch appears in a PR, and not before.

We do however still run on push trigger for the important branches
(master, release-*).

https://github.com/actions/setup-node/blob/main/docs/advanced-usage.md#caching-packages-dependencies