ci: use Python 3.14 for static checks and Python 3.11-3.14 for unit tests

Author: tngraf

.github/workflows/static-checks.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.11"]
+        python-version: ["3.14"]
 
     steps:
     - uses: actions/checkout@v4

.github/workflows/unit-test.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11"]
+        python-version: ["3.14", "3.13", "3.12", "3.11"]
 
     steps:
     - uses: actions/checkout@v4