Update PyPA "publish to PyPi" github action (#1352)

Summary:
Current `master` version of the PyPA "publish to PyPi" github action is unsupported: https://github.com/pytorch/botorch/actions/runs/2874668079

Update version to `release/v1` as suggested.

Pull Request resolved: #1352

Reviewed By: saitcakmak, mpolson64

Differential Revision: D38786169

Pulled By: Balandat

fbshipit-source-id: 1125dc8d2ed18feb9e4f8cc6d290f3604f1acffe

.github/workflows/deploy_on_release.yml

@@ -58,7 +58,7 @@ jobs:
       run: |
         ./scripts/build_and_verify_py_packages.sh
     - name: Deploy to PyPI
-      uses: pypa/gh-action-pypi-publish@master
+      uses: pypa/gh-action-pypi-publish@release/v1
       with:
         user: __token__
         password: ${{ secrets.PYPI_TOKEN }}

.github/workflows/nightly.yml

@@ -67,7 +67,7 @@ jobs:
       run: |
         ./scripts/build_and_verify_py_packages.sh
     - name: Deploy to Test PyPI
-      uses: pypa/gh-action-pypi-publish@master
+      uses: pypa/gh-action-pypi-publish@release/v1
       with:
         user: __token__
         password: ${{ secrets.TEST_PYPI_TOKEN }}