Update publish-pypi.yml (#74)

Author: spacemanspiff2007

.github/workflows/publish-pypi.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
       with:
-        ref: main
+        ref: master
     - name: Set up Python 3.10
       uses: actions/setup-python@v4
       with: