[CI] Update runner label from aipu to aipu3.3 (#741)

Update runs-on from 'aipu' to 'aipu3.3' to match the actual
label configured on the self-hosted runner machine.

Signed-off-by: Liu Haoyu <liuhaoyutz@126.com>

Author: liuhaoyutz

.github/workflows/aipu3.3-build-and-test.yml

@@ -12,7 +12,7 @@ concurrency:
 
 jobs:
   aipu-build-and-test:
-    runs-on: aipu
+    runs-on: aipu3.3
     if: ${{ github.repository == 'FlagTree/flagtree' || github.repository == 'flagos-ai/flagtree' }}
     steps:
       - name: Setup environment