Bump NodeJS version

[aliphys]

actions/checkout@3 is already in use e.g. in the ArduinoBLE repo:

https://github.com/arduino-libraries/ArduinoBLE/blob/55e7bb6a625f8ef8fab2a72e21ab1185dfcd70c0/.github/workflows/compile-examples.yml#L20-L21

Updating the example to use v3, in line with Github's recommendation

[per1234]

Thanks for your pull request @aliphys!

The workflow run failed because there is no v2 ref in the arduino/compile-sketches repository(https://github.com/arduino/compile-sketches) (that project is still in the 1.x major version series because no breaking changes have been made since the 1.0.0 release):

https://github.com/arduino/arduino-cli-example/actions/runs/4812019939/jobs/8566737117#step:1:35

Error: Unable to resolve action `arduino/compile-sketches@v2`, unable to find version `v2`

I am proposing an alternative to fully manual maintenance of the action dependencies of the workflow:

#18

That system is already in use for maintenance of the workflow in the master branch, but I forgot to set it up for this branch as well.

If #18, we would receive a subsequent pull request from Dependabot to update the outdated actions/checkout action reference.

[per1234]

Closing as superseded by the automated PR #21 produced by the newly added automated dependency management system #18

Thanks for initiating this work @aliphys!