Fix building wheels on OSX (#14046)

* Fix building wheels on OSX

Follow-up to #13983. I missed a breaking change in setup-python v4.
Serves me right for rushing to cut through the dependabot spam.

* Changelog

* Merge changelog

Author: David Robertson

.github/workflows/release-artifacts.yml

@@ -108,6 +108,10 @@ jobs:
       - uses: actions/checkout@v3
 
       - uses: actions/setup-python@v4
+        with:
+          # setup-python@v4 doesn't impose a default python version. Need to use 3.x
+          # here, because `python` on osx points to Python 2.7.
+          python-version: "3.x"
 
       - name: Install cibuildwheel
         run: python -m pip install cibuildwheel==2.9.0 poetry==1.2.0

changelog.d/14046.misc

@@ -0,0 +1 @@
+Bump actions/setup-python from 2 to 4.