Template workflow action dependency update system is broken

[per1234]

It seems that something recently broke in the system that is used to provide Dependabot PRs for updates to the actions dependencies of the the "template" GitHub Actions workflows.

The last PR was #206, but we didn't get the expected PRs for the available actions/setup-go and codecov/codecov-action bumps and I have been seeing a mysterious error there for some time:

https://github.com/arduino/tooling-project-assets/network/updates

Dependabot couldn't find a <anything>.yml
Dependabot couldn't find a .yml.

Dependabot requires a .yml to evaluate your Github_actions dependencies. It had expected to find one at the path: /workflow-templates/dependabot/workflow-template-copies/action.yml or /.github/workflows/<anything>.yml.

There hasn't been any meaningful changes to the Dependabot configuration file or to the storage of the workflow copies, so it must have been an external change in how Dependabot works.

[per1234]

I investigated and reported the breaking change to Dependabot: dependabot/dependabot-core#5047

I have not been able to find any workaround for the issue, so we will be forced to manually maintain the workflow dependencies until such time as the capability is restored.