ci: fix runner (#47)

Author: bagel897

.github/workflows/CI.yml

@@ -28,7 +28,7 @@ jobs:
             target: x86_64
           # - runner: ubuntu-22.04
           #   target: x86
-          - runner: ubuntu-latest-8
+          - runner: ubuntu-latest-8-arm
             target: aarch64
           # - runner: ubuntu-22.04
           #   target: armv7