Update runner for Modernizer job to ubuntu-latest

Changed the runner from ubuntu-slim to ubuntu-latest for the Modernizer job due to 15min time-out.

Author: koppor

.github/workflows/tests-code.yml

@@ -130,7 +130,8 @@ jobs:
 
   modernizer:
     name: Modernizer
-    runs-on: ubuntu-slim
+    # too slow on ubuntu-slim
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout source
         uses: actions/checkout@v6