fix: Update to MorphoCloud/MorphoCloudWorkflow@328e926

List of MorphoCloudWorkflow changes:

```
$ git shortlog a644d53..328e926 --no-merges
Jean-Christophe Fillion-Robin (1):
      fix(extract-issue-fields): Avoid evaluation of backticks as bash command
```

See MorphoCloud/MorphoCloudWorkflow@a644d53...328e926

.github/actions/extract-issue-fields/action.yml

@@ -48,36 +48,50 @@ runs:
     - name: Display parsed data
       shell: bash
       run: |
-        echo ${{ toJSON(steps.parse.outputs.data) }} | jq .
+        cat <<'EOF' | jq .
+        ${{ steps.parse.outputs.data }}
+        EOF
 
     - name: Extract fields
       id: extract
       shell: bash
       run: |
-        instance_flavor=$(echo ${{ toJSON(steps.parse.outputs.data) }} | \
-            jq -r '."cloud-computing-instance-flavor".text | split(" - ")[0]')
+        instance_flavor=$(
+          cat <<'EOF' | \
+            jq -r '."cloud-computing-instance-flavor".text | split(" - ")[0]'
+        ${{ steps.parse.outputs.data }}
+        EOF
+        )
         echo "instance_flavor [$instance_flavor]"
         echo "instance_flavor=$instance_flavor" >> $GITHUB_OUTPUT
 
         orcid=$(
-          echo ${{ toJSON(steps.parse.outputs.data) }} |
+          cat <<'EOF' | \
           jq -r ".orcid.text"
+        ${{ steps.parse.outputs.data }}
+        EOF
         )
+        echo "orcid [$orcid]"
         echo "orcid=$orcid" >> $GITHUB_OUTPUT
 
         # Also strip "<" and ">" to convert from "<[email protected]>" to "[email protected]"
         email=$(
-          echo ${{ toJSON(steps.parse.outputs.data) }} |
-          jq -r ".email.text" |
+          cat <<'EOF' | \
+          jq -r ".email.text" | \
           sed -E 's/^<([^<>]+)>$/\1/'
+        ${{ steps.parse.outputs.data }}
+        EOF
         )
+        echo "email [$email]"
         echo "email=$email" >> $GITHUB_OUTPUT
 
         # Also strip "<" and ">" to convert from "<[email protected]>" to "[email protected]"
         confirm_email=$(
-          echo ${{ toJSON(steps.parse.outputs.data) }} |
-          jq -r '."confirm-email".text // empty' |
+          cat <<'EOF' | \
+          jq -r '."confirm-email".text // empty' | \
           sed -E 's/^<([^<>]+)>$/\1/'
+        ${{ steps.parse.outputs.data }}
+        EOF
         )
 
         # If the "Confirm Email" field is missing (e.g., in older issues),
@@ -86,4 +100,5 @@ runs:
           confirm_email="$email"
         fi
 
+        echo "confirm_email [$confirm_email]"
         echo "confirm_email=$confirm_email" >> $GITHUB_OUTPUT