Update GitHub actions to use pipenv

Using pipenv for GitHub actions requires updating the syntax, but the purpose of the actions otherwise remains the same.

.github/workflows/publish-release.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install pipenv
+          pip install --python 3.10
           pipenv install build
           pipenv install wheel
       - name: Build a binary wheel and a source tarball

.github/workflows/test-library.yml

@@ -57,7 +57,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install pipenv
-        pipenv install --deploy
+        pipenv install --python ${{ matrix.python-version }}
         pipenv install flake8 pytest
     - name: Lint with flake8
       run: |