Merge pull request #1738 from pints-team/Deprecated-packages_dir-syntax

Update upload-to-pypi.yml

Author: MichaelClerx

.github/workflows/upload-to-pypi.yml

@@ -59,4 +59,4 @@ jobs:
 
       - uses: pypa/gh-action-pypi-publish@v1.13.0
         with:
-          packages_dir: dist/
+          packages-dir: dist/