Update repository cache in valgrind test workflow

Author: kala13x

.github/workflows/tests.yml

@@ -14,6 +14,9 @@ jobs:
       - name: Checkout Code
         uses: actions/checkout@v3
 
+      - name: Update repository cache
+        run: sudo apt-get update
+
       - name: Install Dependencies
         run: sudo apt-get install -y build-essential valgrind cmake libssl-dev