[.github] codecov.yml: Run sudo apt-get update first.

codecov runs are failing because the package database is out of date, so
it tries downloading package versions that are no longer present on the
Ubuntu mirror.

.github/workflows/codecov.yml

@@ -7,7 +7,9 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
       - name: Install required packages
-        run: sudo apt-get install --yes cmake ninja-build libcurl4-openssl-dev zlib1g-dev libpng-dev libjpeg-dev nettle-dev pkg-config libtinyxml2-dev gettext libseccomp-dev libzstd-dev liblz4-dev liblzo2-dev qtbase5-dev qttools5-dev-tools extra-cmake-modules libkf5kio-dev libkf5widgetsaddons-dev libkf5filemetadata-dev libglib2.0-dev libgtk-3-dev libcairo2-dev libthunarx-3-dev libgsound-dev libnautilus-extension-dev libgtk-4-dev lcov
+        run: |
+          sudo apt-get update
+          sudo apt-get install --yes cmake ninja-build libcurl4-openssl-dev zlib1g-dev libpng-dev libjpeg-dev nettle-dev pkg-config libtinyxml2-dev gettext libseccomp-dev libzstd-dev liblz4-dev liblzo2-dev qtbase5-dev qttools5-dev-tools extra-cmake-modules libkf5kio-dev libkf5widgetsaddons-dev libkf5filemetadata-dev libglib2.0-dev libgtk-3-dev libcairo2-dev libthunarx-3-dev libgsound-dev libnautilus-extension-dev libgtk-4-dev lcov
       - name: Run CMake
         run: cmake . -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr -DBUILD_TESTING=ON -DENABLE_COVERAGE=ON -G Ninja
       - name: Run Ninja