Update validate.yml

.github/workflows/validate.yml

@@ -7,6 +7,8 @@ jobs:
     validate:
         runs-on: ubuntu-latest
         steps:
+            - uses: "actions/checkout@v3"
+            - uses: "home-assistant/actions/hassfest@master"
             - name: Checkout
               uses: actions/checkout@v2
             - name: HACS validation