Revert "Try to still publish if only the ASAN build fails"

* This reverts commit 19d4327.
* Let's try to make it required again.

Author: eregon

.github/workflows/build.yml

@@ -83,7 +83,6 @@ jobs:
         include:
           - { os: ubuntu-24.04, name: asan }
     runs-on: ${{ matrix.os }}
-    continue-on-error: ${{ matrix.name == 'asan' }}
     steps:
     - name: Clone ruby
       uses: actions/checkout@v4