ci: work around issue with pypi-server and older python

It failes to start with:

usage: pypi-server run [-h] [-v] [--log-file FILE] [--log-stream STREAM]
[--log-frmt FORMAT] [--hash-algo HASH_ALGO]
[--backend {auto,simple-dir,cached-dir}] [--version]
[-p PORT] [-i HOST] [-a AUTHENTICATE]
[-P PASSWORD_FILE] [--disable-fallback]
[--fallback-url FALLBACK_URL]
[--health-endpoint HEALTH_ENDPOINT] [--server METHOD]
[-o] [--welcome HTML_FILE] [--cache-control AGE]
[--log-req-frmt FORMAT] [--log-res-frmt FORMAT]
[--log-err-frmt FORMAT]
[package_directory ...]
pypi-server run: error: argument --welcome: invalid html_file_arg value:
'pypiserver/welcome.html'

But only on those versions.

Author: oz123

Diff for: .github/workflows/ci.yaml

@@ -104,17 +104,24 @@ jobs:
           git submodule update --init --recursive
           python -m pip install -e . --upgrade
           pipenv install --deploy --dev --python=${{ steps.python-path.outputs.path }}
-          python -m pip install pypiserver==2.3.2
+          if [[ "${{ matrix.python-version }}" == 3.9* ]] || [[ "${{ matrix.python-version }}" == 3.10* ]]; then
+             python -m pip install pypiserver==2.3.2
+          fi
       - name: Run pypiserver Windows
         run: |
           cmd /c start pipenv run pypi-server run -v --host=0.0.0.0 --port=8080 --hash-algo=sha256 --disable-fallback ./tests/pypi/ ./tests/fixtures
         if: ${{matrix.os  == 'Windows' }}
       - name: Run pypiserver ${{ matrix.os }}
         run: |
-          pipenv run pypi-server --version
-          pypi-server --version
-          pypi-server run -v --host=0.0.0.0 --port=8080 --hash-algo=sha256 --disable-fallback ./tests/pypi/ ./tests/fixtures &
-          pipenv run pypi-server run -v --host=0.0.0.0 --port=8081 --hash-algo=sha256 --disable-fallback ./tests/pypi/ ./tests/fixtures &
+          if [[ "${{ matrix.python-version }}" == 3.9* ]] || [[ "${{ matrix.python-version }}" == 3.10* ]]; then
+            # For Python 3.9 and 3.10, run without pipenv
+            pypi-server --version
+            pypi-server run -v --host=0.0.0.0 --port=8080 --hash-algo=sha256 --disable-fallback ./tests/pypi/ ./tests/fixtures &
+          else
+            # For Python 3.11, 3.12, and 3.13, run with pipenv
+            pipenv run pypi-server --version
+            pipenv run pypi-server run -v --host=0.0.0.0 --port=8080 --hash-algo=sha256 --disable-fallback ./tests/pypi/ ./tests/fixtures &
+          fi
         if: contains(matrix.os, 'Ubuntu') || contains(matrix.os, 'macOS')
       - name: Run tests
         env: