fixed pypi release action to install with gpu flag

Author: phflot

.github/workflows/pypi-release.yml

@@ -30,7 +30,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
           cache: pip
       - run: python -m pip install -U pip
-      - run: python -m pip install -e .[test,vis]
+      - run: python -m pip install -e .[test,vis,gpu]
       - run: pytest tests/ -v --cov=flowreg3d
 
   build: