Minor CI clarifications

- In the Cygwin CI workflow, move `runs-on` below `strategy`, for
  greater consistency with other workflows.

- In the Cygwin CI jobs, use `pwsh` rather than `bash` for the
  `git config` command run outside of Cygwin, since `pwsh` is the
  default shell for such commands, it's the shell the Cygwin setup
  action uses, and it avoids creating the wrong impression that
  `bash` is needed.

- Use "virtual environment" instead of "virtualenv" in some step
  names to avoid possible confusion with the `virtualenv` pacakge.

- Remove comments in the PyPA package upgrade steps, which are
  more self-documenting since 727f4e9 (#2043).

Author: EliahKagan

.github/workflows/alpine-test.yml

@@ -47,13 +47,12 @@ jobs:
         # and cause subsequent tests to fail
         cat test/fixtures/.gitconfig >> ~/.gitconfig
 
-    - name: Set up virtualenv
+    - name: Set up virtual environment
       run: |
         python -m venv .venv
 
     - name: Update PyPA packages
       run: |
-        # Get the latest pip, wheel, and prior to Python 3.12, setuptools.
         . .venv/bin/activate
         python -m pip install -U pip 'setuptools; python_version<"3.12"' wheel
 

.github/workflows/cygwin-test.yml

@@ -7,8 +7,6 @@ permissions:
 
 jobs:
   test:
-    runs-on: windows-latest
-
     strategy:
       matrix:
         selection: [fast, perf]
@@ -20,6 +18,8 @@ jobs:
 
       fail-fast: false
 
+    runs-on: windows-latest
+
     env:
       CHERE_INVOKING: "1"
       CYGWIN_NOWINPATH: "1"
@@ -32,7 +32,7 @@ jobs:
     - name: Force LF line endings
       run: |
         git config --global core.autocrlf false  # Affects the non-Cygwin git.
-      shell: bash  # Use Git Bash instead of Cygwin Bash for this step.
+      shell: pwsh  # Do this outside Cygwin, to affect actions/checkout.
 
     - uses: actions/checkout@v4
       with:
@@ -67,7 +67,7 @@ jobs:
         # and cause subsequent tests to fail
         cat test/fixtures/.gitconfig >> ~/.gitconfig
 
-    - name: Set up virtualenv
+    - name: Set up virtual environment
       run: |
         python3.9 -m venv --without-pip .venv
         echo 'BASH_ENV=.venv/bin/activate' >>"$GITHUB_ENV"
@@ -78,7 +78,6 @@ jobs:
 
     - name: Update PyPA packages
       run: |
-        # Get the latest pip, wheel, and prior to Python 3.12, setuptools.
         python -m pip install -U pip 'setuptools; python_version<"3.12"' wheel
 
     - name: Install project and test dependencies

.github/workflows/pythonpackage.yml

@@ -71,7 +71,6 @@ jobs:
 
     - name: Update PyPA packages
       run: |
-        # Get the latest pip, wheel, and prior to Python 3.12, setuptools.
         python -m pip install -U pip 'setuptools; python_version<"3.12"' wheel
 
     - name: Install project and test dependencies