[CI] Disable testing artifact for Win

.github/workflows/nightly.yml

@@ -110,12 +110,12 @@ jobs:
         cd discord/app-1.0.0
         mkdir modules
 
-    - name: Upload artifact
+#    - name: Upload artifact
-      uses: actions/upload-artifact@v2
+#      uses: actions/upload-artifact@v2
-      with:
+#      with:
-        name: testing
+#        name: testing
-        path: app.asar
+#        path: app.asar
-        retention-days: 1
+#        retention-days: 1
 
     - name: Check if Discord will startup
       run: |