Add Python 3.14 to pyk code quality CI job (#4867)

Author: tothtamas28

.github/workflows/test-pr.yml

@@ -35,7 +35,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
     defaults:
       run:
         working-directory: ./pyk