Updated job runner from ubuntu20.04 to ubuntu24.04 as 20.04 is retired.

Signed-off-by: Chin Yeung Li <tli@nexb.com>

Author: chinyeungli

.github/workflows/docs-ci.yml

@@ -4,7 +4,7 @@ on: [push, pull_request]
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
 
     strategy:
       max-parallel: 4