[BUILD] Update metax to python3.12

Author: zhzhcookie

.github/workflows/metax-build-and-test.yml

@@ -38,15 +38,14 @@ jobs:
         run: |
           set -x
           pip uninstall -y triton
-          source ~/env_setup.sh
           export FLAGTREE_BACKEND=metax
           cd python
-          MAX_JOBS=32 python3.10 -m pip install . --no-build-isolation
+          MAX_JOBS=32 python3 -m pip install . --no-build-isolation
 
       - name: FlagTree Test on Metax
         if: steps.check_backend.outputs.should_skip != 'true'
         shell: bash
         run: |
           set -x
           source ~/env.sh
-          python3.10 -m pytest -s third_party/metax/python/test/unit
+          python3 -m pytest -s third_party/metax/python/test/unit

.github/workflows/metax-delivery.yml

@@ -12,7 +12,7 @@ on:
         default: '0.5.0'
       PYTHON_VER:
         required: true
-        default: '3.10'
+        default: '3.12'
       PLATFORM:
         required: true
         default: 'x86_64'
@@ -27,7 +27,7 @@ on:
       PYTHON_VER:
         type: string
         required: true
-        default: '3.10'
+        default: '3.12'
       PLATFORM:
         type: string
         required: true