Review of copilot-setup-steps.yml: use correct version of gh aw

Author: edburns

.github/workflows/copilot-setup-steps.yml

@@ -78,7 +78,7 @@ jobs:
       - name: Install gh-aw extension
         uses: github/gh-aw/actions/setup-cli@4d44d0e89851a877f4ddc0cb6c0197e42b1016c5 # v0.73.0
         with:
-          version: v0.68.3
+          version: v0.73.0
 
       # Enable repository pre-commit hooks (Spotless checks for Java source changes)
       - name: Enable pre-commit hooks