Update Python version matrix and installation steps

Author: cclauss

.github/workflows/pip_install_pypiwin32.yml

@@ -15,14 +15,17 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.10', 3.12, 3.14, 3.14t]
+        python-version: [3.9, 3.12, 3.14, 3.14t]
         os: [windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v5
       - uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
-      - if: matrix.python-version == '3.10'  # Before 2to3 was removed.
-        run: pip install --editable .
+      # https://github.com/pypa/setuptools/blob/47b724639703d0c512f275a316dbb99e6c226e38/CHANGES.rst#v5800
+      - if: matrix.python-version == '3.9'  # Before 2to3 for builds was removed.
+        run: |
+          pip install ´setuptools<58.0.0'
+          pip install --editable .
       - run: pip install pypiwin32