Update CI Python matrix to 3.11-3.14

Bump the GitHub Actions Python test matrix in .github/workflows/install.yml from 3.5-3.8 to 3.11-3.14 so CI runs against current Python releases. This updates the workflow to drop legacy versions and keep testing aligned with modern Python support.

Author: kozo2

.github/workflows/install.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8]
+        python-version: [3.11, 3.12, 3.13, 3.14]
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python