chore: fix syntax in deploy demo yaml

[gfellerph]

Let's see if this fixes the failing workflow runs.

[changeset-bot]

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Latest commit: 1fc3bf1

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[alizedebray]

The demo no longer exists on main. This workflow should be on the branch from where we want to release the demo, or at least check out the correct branch.