Update indy-node, token-plugin and GitHub actions versions

[WadeBarnes]

This PR combines the indy-node and token-plugin changes from:

• https://github.com/sovrin-foundation/sovrin/pull/354
• https://github.com/sovrin-foundation/sovrin/pull/355
• https://github.com/sovrin-foundation/sovrin/pull/357

and includes updates to the version of the GitHub actions used by the workflows.