tools: run test-ubsan on ubuntu-latest

PR-URL: #52375
Reviewed-By: Yagiz Nizipli <yagiz.nizipli@sentry.io>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>

.github/workflows/test-ubsan.yml

@@ -38,7 +38,7 @@ permissions:
 jobs:
   test-ubsan:
     if: github.event.pull_request.draft == false
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     env:
       CC: gcc
       CXX: g++