An error message from github actions

When running our github actions there is following message for each action:

```
Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: andstor/file-existence-action@20b4d2e596410855db8f9ca21e96fbe18e12930b. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.
```

It seems that we need to change the "Check coredump existence" step to use a later version.

Find the GitHub Actions workflow containing the "Check coredump existence" step and inspect its andstor/file-existence-action reference. Update that action to a Node.js 20-compatible version, then run the workflow and confirm the Node.js 16 deprecation message no longer appears.

Written by the indexing model from the issue text.