adjusted deprecated repository_url with repository-url (#342)

Author: DjoykeAbyah

.github/workflows/pypipublish.yml

@@ -38,7 +38,7 @@ jobs:
         uses: pypa/gh-action-pypi-publish@release/v1
         with:
           password: ${{ secrets.PYPI_TEST_KEY }}
-          repository_url: https://test.pypi.org/legacy/
+          repository-url: https://test.pypi.org/legacy/
       - name: Publish distribution 📦 to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
         with: