Simplify workflow by removing Windows/macOS-specific steps

- Limit OS matrix to `ubuntu-latest` for CI tests.
- Remove Windows and macOS from the test matrix.

Author: kangtegong

.github/workflows/push-test.yml

@@ -6,11 +6,8 @@ jobs:
   test:
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: [ubuntu-latest]
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
-        exclude:
-          - os: windows-latest
-            python-version: "3.13"
     runs-on: ${{ matrix.os }}
 
     steps:
@@ -22,11 +19,6 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
         check-latest: true
-
-    - name: Install dependencies
-      if: runner.os == 'Windows'
-      run: pip install -r requirements.txt
-   
     - name: Run tests
       run: |
         python tests/runtests.py