Use upstream version of Ana06/[email protected] once released

[Ana06]

In https://github.com/fireeye/capa/pull/584 we started using Ana06/[email protected] as jitterbit/get-changed-files@v1 doesn't support pull_request_target (which we needed to use for the changelog action) and the project didn't seem to be maintained anymore. It seems that there are now plans to release jitterbit/get-changed-files: https://github.com/jitterbit/get-changed-files/pull/27#issuecomment-850075624 and that it will include very similar changes to Ana06/[email protected]. We should update to use the community version if jitterbit/get-changed-files continues to be maintained and releases a new version. I am documenting this here so that we don't forget.