Tests(GHActions): Do not exclude Python 2.7 on w32

Also restore some old Pythons on OSX.

Author: phdru

.github/workflows/run-tests.yaml

@@ -12,16 +12,10 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
         python-version: ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
         exclude:
-        - os: windows-latest
-          python-version: "2.7"
         - os: macos-latest
           python-version: "2.7"
         - os: macos-latest
           python-version: "3.5"
-        - os: macos-latest
-          python-version: "3.6"
-        - os: macos-latest
-          python-version: "3.7"
         include:
         - os: ubuntu-latest
           os-name: Linux