Add missing apt-get update

Author: jonathangreen

.github/workflows/sdist.yml

@@ -20,6 +20,7 @@ jobs:
           python setup.py sdist
       - name: Install test dependencies
         run: |
+          sudo apt-get update
           sudo apt-get install libxml2-dev libxmlsec1-dev libxmlsec1-openssl opensc softhsm2 libengine-pkcs11-openssl
           pip install --upgrade -r requirements-test.txt --no-binary lxml
           pip install dist/xmlsec-$(python setup.py --version).tar.gz