Update Python version matrix in exercise 4 workflow to include 3.14

Author: jacobsolbergholm

.github/workflows/exercise4_workflow.yml

@@ -14,7 +14,7 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                python-version: [3.12, 3.13]
+                python-version: [3.12, 3.13, 3.14]
                 os: [ubuntu-latest, windows-latest,macos-latest]
         steps:
             - name: Checkout repository