fixup! ci(ui-tests): take a screenshot when canceled

Author: dscho

.github/workflows/ui-tests.yml

@@ -127,7 +127,7 @@ jobs:
       - name: Take screenshot, if canceled
         id: take-screenshot
         if: cancelled() && steps.ui-tests.conclusion == 'cancelled'
-        uses: pwsh
+        shell: pwsh
         run: |
           [Reflection.Assembly]::LoadWithPartialName("System.Drawing")
           function screenshot([Drawing.Rectangle]$bounds, $path) {