GitHub Actions: Add Python 3.14 to test matrix

https://www.python.org/download/pre-releases

https://www.python.org/downloads/release/python-3140rc2

Author: cclauss

.github/workflows/test-suite.yml

@@ -14,11 +14,11 @@ jobs:
 
     strategy:
       matrix:
-        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"]
 
     steps:
-      - uses: "actions/checkout@v4"
-      - uses: "actions/setup-python@v5"
+      - uses: actions/checkout@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "${{ matrix.python-version }}"
           allow-prereleases: true
@@ -30,5 +30,6 @@ jobs:
         run: "scripts/build"
       - name: "Run tests"
         run: "scripts/test"
+        timeout-minutes: 10  # TODO(@cclauss): Remove once Python 3.14 tests are passing.
       - name: "Enforce coverage"
         run: "scripts/coverage"