Bump softprops/action-gh-release from 0.1.14 to 0.1.15 (#268)

Author: dependabot[bot]

.github/workflows/release.yaml

@@ -38,7 +38,7 @@ jobs:
         run: |
           twine upload --verbose dist/*
       - name: Upload release assets
-        uses: softprops/[email protected].14
+        uses: softprops/[email protected].15
         with:
           files: |
             dist/*.whl