CI: Fix mako install

.github/workflows/main.yml

@@ -119,7 +119,9 @@ jobs:
     steps:
     - uses: actions/checkout@v1
     - name: install dependencies
-      run: sudo apt-get install build-essential python3-mako cmake
+      run: |
+        python -m pip install --upgrade pip
+        pip install mako
     - name: configure
       run: cd build && cmake ../src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr
     - name: build