more tweaks to the CI matrix

Author: apdavison

.github/workflows/test.yml

@@ -17,8 +17,12 @@ jobs:
         req-version: ["oldest", "middle", "newest"]
         os: ["ubuntu-24.04"]
         exclude:
+          - python-version: "3.10"
+            req-version: "newest"
           - python-version: "3.12"
             req-version: "oldest"
+          - python-version: "3.14"
+            req-version: "middle"
           - python-version: "3.14"
             req-version: "oldest"
     steps: