Update data-platform-workflows used in this repository to avoid Node16 warnings

## Steps to reproduce
The following [test run](https://github.com/canonical/data-platform-libs/actions/runs/9555432059?pr=177) has a bunch of warnings for deprecation of `Node 16` due to usage of `actions/checkout@v3` which originates from `data-platform-workflows@v2`

## Expected behavior
No warnings

## Actual behavior
A lot of warnings because we are using a very old version of data-platform-workflows

## Versions
n/a

## Log output
n/a

## Additional context
n/a

Inspect the repository's GitHub Actions workflow references to data-platform-workflows@v2 and review the linked test run for the Node 16 warnings. Update the referenced workflow version, then rerun the affected checks and confirm that the deprecation warnings are gone.

Written by the indexing model from the issue text.