Github actions: add apt update to avoid outdated packages (404s)

Author: edenhill

.github/workflows/base.yml

@@ -6,6 +6,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - run: |
+          sudo apt update
           sudo apt install -y python3 python3-pip python3-setuptools libcurl4-openssl-dev libssl-dev libsasl2-dev
           python3 -m pip install -r tests/requirements.txt
       - run: |
@@ -24,6 +25,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - run: |
+          sudo apt update
           sudo apt install -y python3 python3-pip python3-setuptools clang-format
           python3 -m pip install -r packaging/tools/requirements.txt
       - name: Style checker