fix: workflow version

.github/workflows/validate.yml

@@ -9,7 +9,7 @@ jobs:
   run:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - run: sudo apt-get install -y yara
       - run: |
           output=$(find . -type f -iname "*.yara" -exec yara -w {} /dev/null \; 2>&1)