Revert "Python 3.9 wheels are no longer needed (python-pillow#9214)"

This reverts commit a953d86.

Author: R-YaTian

.github/workflows/wheels.yml

@@ -55,7 +55,7 @@ jobs:
             platform: macos
             os: macos-15-intel
             cibw_arch: x86_64
-            build: "cp3{10,11}*"
+            build: "cp3{9,10,11}*"
             macosx_deployment_target: "10.10"
           - name: "macOS 10.13 x86_64"
             platform: macos