ci: workflows: test: test Python v3.14

With the release of Python v3.14, update tested versions. Also test a
middle version.

Signed-off-by: Jordan Yates <jordan@embeint.com>

Author: JordanYates

.github/workflows/test.yml

@@ -17,7 +17,7 @@ jobs:
       matrix:
         # Test the extreme Python versions for now to reduce CI runtime
         os: [ubuntu-latest, windows-latest]
-        python-version: ['3.10', '3.13']
+        python-version: ['3.10', '3.12', '3.14']
     steps:
       - uses: actions/checkout@v4
         # This is enough to find many quoting issues