try pull tags, bump python version matrix

.github/workflows/runtests.yml

@@ -26,10 +26,14 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v4
+
+      - name: "get tags"
+        run: |
+          git fetch --tags --force # Retrieve annotated tags.
 
       - name: Setup conda
         uses: conda-incubator/setup-miniconda@v2