Trigger build and release on upstream release to `resvg`

[jboarman]

Since our key dependency is resvg, we need to ensure we are getting all the latest updates when those are released.

There does not appear to be a GitHub Action trigger available that activates when an update to a dependency is released. So, we will need to come up with a mechanism for identifying the current release number and comparing that to some tracking that within GH Actions, such as use of upload-artifact and download-artifact for tracking that state.

Another approach may be to leverage GitHub's Dependabot to trigger a PR based on the release of a dependency.