fix: Update to MorphoCloud/MorphoCloudWorkflow@b303508

List of MorphoCloudWorkflow changes:

```
$ git shortlog d4e1ccb..b303508 --no-merges
Jean-Christophe Fillion-Robin (1):
      feat: Rename command from "/delete" to "/delete_instance"
```

See MorphoCloud/MorphoCloudWorkflow@d4e1ccb...b303508

.github/workflows/control-instance.yml

@@ -16,7 +16,7 @@ jobs:
       ${{ !github.event.issue.pull_request && (
       contains(github.event.comment.body, '/unshelve') ||
       contains(github.event.comment.body, '/shelve') ||
-      contains(github.event.comment.body, '/delete') ) }}
+      contains(github.event.comment.body, '/delete_instance') ) }}
     steps:
       - name: unshelve command
         id: unshelve_command
@@ -46,7 +46,7 @@ jobs:
         id: delete_command
         uses: github/[email protected]
         with:
-          command: "/delete"
+          command: "/delete_instance"
           reaction: "rocket"
           allowed_contexts: "issue"
           permissions: "write,maintain,admin"

issue-commands.md

@@ -3,12 +3,12 @@
 _The commands described below may be added as issue comments. Only one command
 may be entered per comment._
 
-| Command         | Description                                        | Who                  |
-| --------------- | -------------------------------------------------- | -------------------- |
-| `/shelve`       | Shelve the instance.                               | Issue creator, Admin |
-| `/unshelve`     | Unshelve the instance.                             | Issue creator, Admin |
-| `/encode_email` | Update issue description obfuscating email.        | Issue creator, Admin |
-| `/decode_email` | Update issue description deobfuscating email.      | Issue creator, Admin |
-| `/email`        | Send email to _Issue creator_ with connection URL. | Issue creator, Admin |
-| `/create`       | Create the instance.                               | Admin                |
-| `/delete`       | Delete the instance.                               | Admin                |
+| Command            | Description                                        | Who                  |
+| ------------------ | -------------------------------------------------- | -------------------- |
+| `/shelve`          | Shelve the instance.                               | Issue creator, Admin |
+| `/unshelve`        | Unshelve the instance.                             | Issue creator, Admin |
+| `/encode_email`    | Update issue description obfuscating email.        | Issue creator, Admin |
+| `/decode_email`    | Update issue description deobfuscating email.      | Issue creator, Admin |
+| `/email`           | Send email to _Issue creator_ with connection URL. | Issue creator, Admin |
+| `/create`          | Create the instance.                               | Admin                |
+| `/delete_instance` | Delete the instance.                               | Admin                |