remove python3.9 test ci

Author: EmmanuelNiyonshuti

.github/workflows/tests.yaml

@@ -19,7 +19,6 @@ jobs:
           - {python: '3.12'}
           - {python: '3.11'}
           - {python: '3.10'}
-          - {python: '3.9'}
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - uses: astral-sh/setup-uv@f0ec1fc3b38f5e7cd731bb6ce540c5af426746bb # v6.1.0