🔧 MAINTAIN: update GH action

Author: chrisjsewell

.github/workflows/tests.yml

@@ -121,7 +121,7 @@ jobs:
         pip install wheel
         python setup.py sdist bdist_wheel
     - name: Publish
-      uses: pypa/gh-action-pypi-publish@v1.1.0
+      uses: pypa/gh-action-pypi-publish@v1.3.1
       with:
         user: __token__
         password: ${{ secrets.PYPI_KEY }}