try with newer version of ubuntu (and maybe clang?)

Author: ParkMyCar

.github/workflows/main.yml

@@ -20,7 +20,7 @@ jobs:
             os: ubuntu-latest
             rust: stable
           - build: ubuntu-old
-            os: ubuntu-20.04
+            os: ubuntu-24.04
             rust: stable
           - build: macos
             os: macos-latest