chore: update runners

Author: mattsse

.github/workflows/tests.yml

@@ -8,10 +8,7 @@ on:
   pull_request:
 jobs:
   test-bot:
-    strategy:
-      matrix:
-        os: [macos-13, macos-14]
-    runs-on: ${{ matrix.os }}
+    runs-on: macos-14
     steps:
       - name: Set up Homebrew
         id: set-up-homebrew
@@ -42,5 +39,5 @@ jobs:
         if: always() && github.event_name == 'pull_request'
         uses: actions/upload-artifact@v4
         with:
-          name: bottles-${{ strategy.job-index }}
+          name: bottles
           path: "*.bottle.*"