test: use blacksmith runner

Author: tobyhede

.github/workflows/test.yml

@@ -14,7 +14,7 @@ env:
 jobs:
   test:
     name: Test
-    runs-on: buildjet-16vcpu-ubuntu-2204
+    runs-on: blacksmith-8vcpu-ubuntu-2404
     steps:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/setup-test