fix: Add py3.8 test job.

Author: mike-oakley

.github/workflows/publish.yml

@@ -23,7 +23,7 @@ jobs:
         uses: snok/install-poetry@v1
         with:
           virtualenvs-create: false
-          version: 1.5.0
+          version: 1.5.1
       - name: Build package distribution
         run: poetry build
       - name: Upload package artifact

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11']
+        python-version: ['3.9', '3.9', '3.10', '3.11']
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
@@ -26,7 +26,7 @@ jobs:
     - name: Install Poetry
       uses: snok/install-poetry@v1
       with:
-        version: 1.5.0
+        version: 1.5.1
         virtualenvs-create: true
         virtualenvs-in-project: true
     - name: Run tox test suite