Update CI workflow to exclude Python 3.9

Removed Python 3.9 from the CI workflow matrix.

Author: auvipy

.github/workflows/ci.yaml

@@ -7,7 +7,7 @@ jobs:
     runs-on: blacksmith-4vcpu-ubuntu-2204
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.10', '3.11', '3.12', '3.13']
     steps:
       - name: Check out code from GitHub
         uses: actions/checkout@v4
@@ -26,7 +26,7 @@ jobs:
     runs-on: blacksmith-4vcpu-ubuntu-2204
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.10', '3.11', '3.12', '3.13']
     steps:
       - name: Check out code from GitHub
         uses: actions/checkout@v4