[BugFix] use Python 3.9 to build wheel

Author: XuehaiPan

.github/workflows/dist.yml

@@ -109,8 +109,10 @@ jobs:
           - { runner: macos-latest, toolkit: "Metal" }
         python-version:
           # Wheels are built with Python 3.8 Limited API, they should work with all Python >= 3.8.
-          # Only build wheels against Python 3.8 to save CI resources.
-          - "3.8"
+          # Only build wheels against Python 3.8 Limited API to save CI resources.
+          # FIXME: Here we use Python 3.9 because our dependency `apache-tvm-ffi` claims to support
+          #        Python 3.8 but it depends on a version of `ml-dtypes` that requires Python >= 3.9.
+          - "3.9"
       fail-fast: false
     timeout-minutes: 120
     runs-on: ${{ matrix.target.runner }}