fix: use switch and not checkout

01_essentials/05-merge-conflicts/setup.ps1

@@ -60,7 +60,7 @@ git add config.json
 git commit -m "Add timeout configuration" | Out-Null
 
 # Switch to feature branch: Add debug setting (conflicting change)
-git checkout update-config | Out-Null
+git switch update-config | Out-Null
 
 $featureConfig = @"
 {
@@ -78,7 +78,7 @@ git add config.json
 git commit -m "Add debug mode configuration" | Out-Null
 
 # Switch back to main branch
-git checkout main | Out-Null
+git switch main | Out-Null
 
 # Return to module directory
 Set-Location ..