ci: Launch create-artifacts.py with python

We have occasional CI failures on Windows where the environment
variables don't get set so the artifact upload fails. Looking at the
logs, it doesn't even appear the create-artifact job ran (but there are
no errors). The Windows runners sometimes have trouble launching python
scripts via `./`, so switch to using the python3 executable in hopes
that this helps.

(backport <#4780>)
(cherry picked from commit 962b985)

Author: tgross35

.github/workflows/ci.yaml

@@ -154,7 +154,7 @@ jobs:
       - name: Create CI artifacts
         id: create_artifacts
         if: always()
-        run: ./ci/create-artifacts.py
+        run: python3 ci/create-artifacts.py
       - uses: actions/upload-artifact@v4
         if: always() && steps.create_artifacts.outcome == 'success'
         with: