Add 3.14 to CI, set default to 3.12

Author: Preocts

.github/workflows/python-tests.yml

@@ -14,6 +14,12 @@ on:
       - "main"
 
 jobs:
+  settings:
+    runs-on: "ubuntu-latest"
+    name: "Define workflow settings"
+    outputs:
+      default-python-version: "3.12"
+
   run-tests-and-coverage:
     name: "Run pytest with coverage."
     runs-on: "${{ matrix.os }}"
@@ -68,7 +74,7 @@ jobs:
       - name: "Set up Python"
         uses: "actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b"
         with:
-          python-version: "3.12"
+          python-version: "${{ needs.settings.outputs.default-python-version }}"
 
       - name: "Install nox"
         run: |
@@ -97,7 +103,7 @@ jobs:
       - name: "Set up Python"
         uses: "actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b"
         with:
-          python-version: "3.12"
+          python-version: "${{ needs.settings.outputs.default-python-version }}"
 
       - name: "Install nox"
         run: |