fixup! CI: run the tests using TSan

Author: vouillon

.github/workflows/main.yml

@@ -20,7 +20,9 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
-      - run: sudo apt update
+      - run: |
+          sudo apt update
+          sudo apt install libunwind-dev
         if: ${{ matrix.os == 'ubuntu-24.04-arm' }}
       - uses: ocaml/setup-ocaml@v3
         with: