Update checkout to v4

Author: Margen67

.github/workflows/main.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Get short SHA
         run: echo "SHORT_SHA=${GITHUB_SHA:0:7}" >> $GITHUB_ENV
@@ -49,7 +49,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Download artifacts
         uses: actions/download-artifact@v3