Fix deprecation warning with pypa/gh-action-pypi-publish@master

Author: hugovk

.github/workflows/deploy.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 0
 
@@ -45,7 +45,7 @@ jobs:
           password: ${{ secrets.pypi_password }}
 
       - name: Publish package to TestPyPI
-        uses: pypa/gh-action-pypi-publish@master
+        uses: pypa/gh-action-pypi-publish@release/v1
         with:
           user: __token__
           password: ${{ secrets.test_pypi_password }}