CI: adding python 3.14 to the CI matrix

Author: bsipocz

.github/workflows/tests.yml

@@ -19,7 +19,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
         sphinx: [""]  # Newest Sphinx (any)
         myst-parser: [""]  # Newest MyST Parser (any)
         include: