Ensure that we pick the right macos runner to get a x86 runner

Author: weiznich

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
       matrix:
         rust: ["stable", "beta", "nightly"]
         backend: ["postgres", "mysql", "sqlite"]
-        os: [ubuntu-latest, macos-latest, macos-14, windows-2019]
+        os: [ubuntu-latest, macos-13, macos-14, windows-2019]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout sources