Update CI workflow for running tests

NOTE: the tests fail on versions >= python 3.11, so this change
restricts the test runner to use python 3.10. This is raised in issue #49.

Author: leviathan747

.github/workflows/build-release-artifacts.yaml

@@ -16,9 +16,9 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Set up Python 3
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
-          python-version: 3.x
+          python-version: '3.10'
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip

.github/workflows/publish-pypi-release.yaml

@@ -13,9 +13,9 @@ jobs:
     steps:
     - uses: actions/checkout@master
     - name: Set up Python 3
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v4
       with:
-        python-version: 3.x
+        python-version: '3.10'
     - name: Install pypa/build
       run: python -m pip install build --user
     - name: Build a binary wheel and a source tarball

.github/workflows/run-tests.yaml

@@ -15,17 +15,17 @@ jobs:
     strategy:
       matrix:
         os:               [ubuntu-latest, windows-latest]
-        python-version:   [2.7, 3.x, pypy2, pypy3]
+        python-version:   ['2.7', '3.10', 'pypy2.7', 'pypy3.8']
         exclude:
           # excludes pypy 3 on Windows
           - os: windows-latest
-            python-version: pypy3
+            python-version: 'pypy3.8'
       fail-fast: false
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies

.github/workflows/test-coverage.yaml

@@ -16,7 +16,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: 2.7
       - name: Install dependencies