CI(GHActions): Ensure pip only if needed

This is to work around a problem in conda with Python 3.7 - it brings in wrong version of `setuptools` incompatible with Python 3.7.
CheetahTemplate3 · Sep 17, 2023 · 252f53b · 252f53b
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diff --git a/.github/workflows/test-publish.yaml b/.github/workflows/test-publish.yaml
@@ -63,7 +63,7 @@ jobs:
       - name: Install dependencies
         run: |
           python --version
-          python -m ensurepip
+          python -m pip || python -m ensurepip --default-pip --upgrade
           python -m pip install --upgrade pip setuptools wheel
           pip --version
           pip install --upgrade virtualenv "tox >= 3.15, < 4"

diff --git a/docs/news.rst b/docs/news.rst
@@ -4,6 +4,13 @@ News
 Development (master)
 --------------------
 
+CI:
+
+  - GHActions: Ensure ``pip`` only if needed
+
+    This is to work around a problem in conda with Python 3.7 -
+    it brings in wrong version of ``setuptools`` incompatible with Python 3.7.
+
 3.3.2 (2023-08-08)
 ------------------