Try always running pip on Cygwin as "python -m pip"

Author: EliahKagan

.github/workflows/cygwin-test.yml

@@ -55,20 +55,14 @@ jobs:
         # and cause subsequent tests to fail
         cat test/fixtures/.gitconfig >> ~/.gitconfig
 
-    - name: Ensure the "pip" command is available
-      run: |
-        # This is used unless, and before, an updated pip is installed.
-        ln -s pip3 /usr/bin/pip
-
     - name: Update PyPA packages
       run: |
         # Get the latest pip, wheel, and prior to Python 3.12, setuptools.
-        python -m pip install -U pip $(pip freeze --all | grep -ow ^setuptools)
-        python -m pip install -U wheel
+        python -m pip install -U pip $(pip freeze --all | grep -ow ^setuptools) wheel
 
     - name: Install project and test dependencies
       run: |
-        pip install ".[test]"
+        python -m pip install ".[test]"
 
     - name: Show version and platform information
       run: |