fix: Update to MorphoCloud/MorphoCloudWorkflow@76aad0e

List of MorphoCloudWorkflow changes:

```
$ git shortlog 77076cf..76aad0e --no-merges
Jean-Christophe Fillion-Robin (1):
      fix(create-instance): Update instance polling timeout to 20mins
```

See MorphoCloud/MorphoCloudWorkflow@77076cf...76aad0e

.github/workflows/create-instance.yml

@@ -319,7 +319,7 @@ jobs:
 
           echo Polling "$INSTANCE_NAME" setup status
 
-          max_wait_time=900  # Maximum wait time in seconds (900s -> 15mins)
+          max_wait_time=1200  # Maximum wait time in seconds (1200s -> 20mins)
           wait_interval=5    # Interval between status checks in seconds
           total_wait_time=0