CI(GHActions): Exclude Python 2.7 at w32

It requires VC9 and cannot be installed.

Author: phdru

.github/workflows/run-tests.yaml

@@ -12,6 +12,9 @@ jobs:
         os: [ubuntu-latest, windows-latest]
         python-version: ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "=3.9[build=*_pypy]"]
 
+        exclude:
+        - os: windows-latest
+          python-version: "2.7"
         include:
         - os: ubuntu-latest
           os-name: Linux