github/workflows: bump versions to ubuntu 24.04

Author: Julian Dehm

.github/workflows/django.yml

@@ -8,10 +8,10 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     services:
       postgres:
-        image: postgres:12
+        image: postgres:16
         env:
           POSTGRES_PASSWORD: postgres
         ports:
@@ -26,11 +26,11 @@ jobs:
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with:
-          python-version: '3.8'
+          python-version: '3.12'
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: '18.x'
+          node-version: '20.x'
       - name: Setup Postgres
         env:
           PGPASSWORD: postgres