[metax] change yaml (#2175)

Author: metax666

.github/workflows/_Metax-X86.yaml

@@ -78,7 +78,7 @@ jobs:
 
         run: |
           cd backends/metax_gpu/tests
-          bash run_test.sh -j 32
+          bash run_test.sh -j 16
 
       - name: push whl
         env:

.github/workflows/_Metax_work_private.yaml

@@ -79,7 +79,7 @@ jobs:
 
         run: |
           cd backends/metax_gpu/tests
-          bash run_test.sh -j 32
+          bash run_test.sh -j 16
 
       - name: push whl
         env: