ci: add freethreading 3.14 to the CI matrix (MagicStack#146)

Author: fantix

.github/workflows/release.yml

@@ -78,6 +78,7 @@ jobs:
           - "cp312"
           - "cp313"
           - "cp314"
+          - "cp314t"
         exclude:
           - os: ubuntu-latest
             cibw_arch: universal2

.github/workflows/tests.yml

@@ -32,7 +32,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14", "3.14t"]
         os: [windows-latest, ubuntu-latest, macos-latest]
 
     env: