CI: update VM version

Author: bsipocz

.github/workflows/build.yml

@@ -12,7 +12,7 @@ concurrency:
 jobs:
   # Run "pre-commit run --all-files --hook-stage=manual"
   pre-commit:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
       - uses: actions/checkout@v4