ci: Add `nr-assistant` dependency to `build and push` workflow

[ppawlowski]

Description

This pull requests adds @flowfuse/nr-assistant to the list of dependencies required during nightly build of nr-launcher package. Additionally, it updates reusable workflows to their latest versions.

Related Issue(s)

closes https://github.com/FlowFuse/nr-launcher/issues/259

Checklist

• [x] I have read the contribution guidelines
• [ ] Suitable unit/system level tests have been added and they pass
• [ ] Documentation has been updated
  • [ ] Upgrade instructions
  • [ ] Configuration details
  • [ ] Concepts
• [ ] Changes flowforge.yml?
  • [ ] Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • [ ] Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

• [ ] Includes a DB migration? -> add the area:migration label

[ppawlowski]

Piotr, does this not need a section similar to what project nodes have?

https://github.com/FlowFuse/nr-launcher/pull/260/files#diff-551d1fcf87f78cc3bc18a7b332a4dc5d8773a512062df881c5aba28a6f5c48d7L6-L9

      nr_project_nodes_release_name:
        description: 'nr-project-nodes package version'
        required: false
        default: 'nightly'

Nope, it is a workflow "feature" which we never implemented. However, we might use it in the near future, that is why it is still there.