[3.3] Simplify list of branches in the README (#1255)

.github/workflows/static_checks.yml

@@ -4,10 +4,10 @@ on: [push, pull_request]
 jobs:
   format:
     name: File formatting (file_format.sh)
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v5
 
       - name: Install dependencies
         run: |