Update Occurrences of Old Container Registry Links

[Yummy-Yums]

Problem:

Links that point to ghcr have changed as the team is trying to move repos. this results in an error when one tries to pull a docker image.

Fix

Change the docker image url to new link.

image: ghcr.io/hyperledger-identus/mediator::${MEDIATOR_VERSION:-latest}

instead of

image: ghcr.io/hyperledger/identus-mediator:${MEDIATOR_VERSION:-latest}

mediator/docker-compose.yml

Line 17 in 189ded7

image: ghcr.io/hyperledger/identus-mediator:${MEDIATOR_VERSION:-latest}

[Yummy-Yums]

it got published directly to docker rather than ghcr

[FabioPinheiro]

This is now fixed