test: Verify ladder build against Ubuntu 22.04

As AI Arena switched to Debian 12.

Also, update github actions checkout.

Signed-off-by: Alexander Kurbatov <[email protected]>

Author: alkurbatov

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
         os: [windows-latest, macos-latest, ubuntu-latest]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v5
         with:
           submodules: recursive
 
@@ -35,10 +35,10 @@ jobs:
         run: cmake --build ${{env.BUILD_DIR}} --config ${{env.BUILD_TYPE}} --parallel 2
 
   ladder_build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v5
         with:
           submodules: recursive