Test as well no the free-threaded version of Python 3.14

Author: tleonhardt

.github/workflows/tests.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14-dev"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14", "3.14t"]
       fail-fast: false
 
     runs-on: ${{ matrix.os }}