CI tests: Pin tox==3.8.3 on Windows

Here's a tox bug report for a similar but different issue to that which we are experiencing: tox-dev/tox#1550
dairiki · Sep 20, 2021 · 6565572 · 6565572
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commit 6565572
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -113,6 +113,9 @@ jobs:
         continue-on-error: true
       - name: Install python dependencies
         run: python -m pip install codecov tox
+      - name: Pin tox on Windows
+        if: startsWith(runner.os, 'windows')
+        run: python -m pip install codecov tox==3.8.3
       - name: Run python tests
         run: tox -e py
       - name: Publish coverage