chore: update exercise toolkit start-exercise workflow version to v0.7.3 (#93)

Author: FidelusAleksander

.github/workflows/0-start-exercise.yml

@@ -18,7 +18,7 @@ jobs:
     if: |
       !github.event.repository.is_template
     name: Start Exercise
-    uses: skills/exercise-toolkit/.github/workflows/[email protected].0
+    uses: skills/exercise-toolkit/.github/workflows/[email protected].3
     with:
       exercise-title: "Getting Started with GitHub Copilot"
       intro-message: "Welcome to the exciting world of GitHub Copilot! 🚀 In this exercise, you'll unlock the potential of this AI-powered coding assistant to accelerate your development process. Let's dive in and have some fun exploring the future of coding together! 💻✨"