ci: move update workflow back to ubuntu-latest

Refs #111

Author: joschi

.github/workflows/update.yml

@@ -11,7 +11,7 @@ concurrency:
   cancel-in-progress: true
 jobs:
   update:
-    runs-on: 'ubuntu-slim'
+    runs-on: 'ubuntu-latest'
     steps:
     - uses: actions/checkout@v7
     - name: Install dependencies