Bump actions/download-artifact from 2 to 3 (PowerShell#17829)

Author: dependabot[bot]

.github/workflows/exp-json.yml

@@ -81,7 +81,7 @@ jobs:
         with:
           fetch-depth: '0'
       - name: Download artifacts
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v3
         with:
           name: experimentalJson
       - name: Compare json files