fix: Update to MorphoCloud/MorphoCloudWorkflow@334df2e

List of MorphoCloudWorkflow changes:

```
$ git shortlog ec55302..334df2e --no-merges
Jean-Christophe Fillion-Robin (1):
      fix: Remove redundant comment posted by triggering workflow
```

See MorphoCloud/MorphoCloudWorkflow@ec55302...334df2e

.github/workflows/automatic-instance-shelving.yml

@@ -120,9 +120,6 @@ jobs:
                 gh workflow run control-instance-from-workflow.yml \
                   -f issue_number=$issue_number \
                   -f command_name=shelve
-                gh issue comment $issue_number \
-                  -b "Workflow **control-instance-from-workflow.yml** triggered by **automatic-instance-shelving.yml** for command <tt>shelve</tt>. \
-                  See details [here](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})."
               fi
             done
         env:

.github/workflows/validate-request.yml

@@ -172,9 +172,6 @@ jobs:
           gh workflow run update-issue-from-workflow.yml \
             -f issue_number=$ISSUE_NUMBER \
             -f command_name=$COMMAND_NAME
-          gh issue comment $ISSUE_NUMBER \
-            -b "Workflow **update-issue-from-workflow.yml** triggered by **validate-request.yml** for command <tt>$COMMAND_NAME</tt>. \
-            See details [here](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})."
         env:
           ISSUE_NUMBER: ${{ steps.collect_inputs.outputs.issue_number }}
           COMMAND_NAME: encode_email