ci: Update Debian package index before installing dependencies

Author: dbaty

.github/workflows/ci.yaml

@@ -20,6 +20,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
+        sudo apt-get update
         sudo apt-get install libzbar-dev
         python -m pip install --upgrade pip
         pip install -r requirements-dev.txt
@@ -38,6 +39,7 @@ jobs:
         python-version: '3.14'
     - name: Install dependencies
       run: |
+        sudo apt-get update
         sudo apt-get install libzbar-dev
         python -m pip install --upgrade pip
         pip install -r requirements-dev.txt