Bump jurplel/install-qt-action to v4 (#816)

Author: lu-zero

.github/workflows/main.yml

@@ -62,7 +62,7 @@ jobs:
         run: cargo build
 
       - name: Install Qt
-        uses: jurplel/install-qt-action@v2
+        uses: jurplel/install-qt-action@v4
         with:
           version: '5.15.2'