Fix Github workflow dependency installation

Author: Abogical

.github/workflows/python-app.yml

@@ -25,7 +25,7 @@ jobs:
         python-version: "3.11"
     - name: Install dependencies
       run: |
-        sudo apt install -y libvips-dev
+        sudo apt-get update && sudo apt-get install -y libvips-dev
         pip install -r requirements.txt
     - name: Test with unittest
       run: |