Change build runner to blacksmith-2vcpu-ubuntu-2404

.github/workflows/build.yml

@@ -71,7 +71,7 @@ on:
 jobs:
   build-gki:
     name: "${{ inputs.kernel_version }}.${{ inputs.sublevel }}-${{ inputs.android_version }}-${{ inputs.os_patch_level }} (${{ inputs.variant }})"
-    runs-on: ubuntu-latest
+    runs-on: blacksmith-2vcpu-ubuntu-2404
     timeout-minutes: 120
 
     steps: