add dependency to 'libbenchmark-dev' to the CI workflow

Author: mnikander

.github/workflows/cpp_ci.yaml

@@ -15,7 +15,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install C++ dependencies
-        run: sudo apt-get update && sudo apt-get install -y build-essential cmake libgtest-dev
+        run: sudo apt-get update && sudo apt-get install -y build-essential cmake libgtest-dev libbenchmark-dev
 
       - name: Setup
         run: cmake -B out -S .