Update deprecated actions

Updating GitHub actions marked as deprecated.

Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>

.github/workflows/pipeline.yaml

@@ -14,13 +14,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Install build tools
         run: sudo apt update && sudo apt install -y nasm qemu-utils gocr mkisofs dosfstools
       - name: Build
         run: ./build.sh
       - name: Upload artifacts
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: images
           if-no-files-found: error
@@ -37,17 +37,17 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Install testing tools
         run: sudo apt update && sudo apt install -y gocr qemu-utils qemu qemu-kvm gocr imagemagick
       - name: Download artifacts
-        uses: actions/download-artifact@v4.1.7
+        uses: actions/download-artifact@v4
         with:
           name: images
       - name: Run test
         run: ./test.sh
       - name: Upload artifacts
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: always()
         with:
           name: screendumps
@@ -59,9 +59,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Download artifacts
-        uses: actions/download-artifact@v4.1.7
+        uses: actions/download-artifact@v4
         with:
           name: images
       - name: Create release