Use actions major version in workflows

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
     steps:
       -
         name: Checkout
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v2
       -
         name: Set up QEMU
         id: qemu

.github/workflows/labels.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
       -
         name: Checkout
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v2
       -
         name: Run Labeler
-        uses: crazy-max/ghaction-github-labeler@v3.1.0
+        uses: crazy-max/ghaction-github-labeler@v3