CI: upgrade to Ubuntu 24.04

Job runs are currently failing due to the deprecation/brownout of 20.04.

Signed-off-by: Daniel Maslowski <info@orangecms.org>

Author: orangecms

.github/workflows/gh-pages.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   deploy:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v2
         with: