fix: Update to MorphoCloud/MorphoCloudWorkflow@d4e1ccb

List of MorphoCloudWorkflow changes:

```
$ git shortlog a777131..d4e1ccb --no-merges
Jean-Christophe Fillion-Robin (1):
      fix(actions/control-instance): Remove hard-coded instance name for task state check
```

See MorphoCloud/MorphoCloudWorkflow@a777131...d4e1ccb

.github/actions/control-instance/action.yml

@@ -89,7 +89,7 @@ runs:
       run: |
         source ~/venv/bin/activate
 
-        task_state=$(openstack server show instance-30 -f json | \
+        task_state=$(openstack server show $INSTANCE_NAME -f json | \
           jq -r '.["OS-EXT-STS:task_state"]')
 
         echo "task_state [$task_state]"