[GithubActions] Removing Python 3.9 as we're having issues with PEP 517, packages are being built with name UNKNOWN. Further, this Python version will be deprecated within a few months.

Author: mmmarinho

.github/workflows/python_package.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.9, '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.10', '3.11', '3.12', '3.13']
         os: ['ubuntu-22.04', 'macos-latest', 'windows-latest', 'linux-arm64']
         experimental: [false]
         # exclude: