tests: install libjpeg-turbo, as latest HA seems to require it

Tests involving the camera entity are failing when built against latest HA.

PR #4110

.github/workflows/tests.yml

@@ -32,6 +32,8 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
+          sudo apt-get update
+          sudo apt-get install libjpeg-turbo
           python -m pip install --upgrade pip
           pip install -r requirements-dev.txt
       - name: Full test with pytest