Update CI Python versions

Python 3.8 is EOL, and Python 3.13 was recently released.

Author: calcmogul

.github/workflows/ci.yml

@@ -8,10 +8,8 @@ jobs:
       fail-fast: false
       matrix:
         os: [macos-14, windows-2022, ubuntu-22.04]
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
         exclude:
-          - os: macos-14
-            python-version: '3.8'
           - os: macos-14
             python-version: '3.9'
     name: Test - ${{ matrix.os }}, ${{ matrix.python-version }}
@@ -128,7 +126,7 @@ jobs:
 
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.10'
+          python-version: '3.13'
 
       - name: Install Python dependencies
         run: pip install build