Update CI.yml

Author: fancaiyu

.github/workflows/CI.yml

@@ -16,8 +16,6 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - "3.8"
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
@@ -67,6 +65,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install sphinx
+          pip install -r requirements.txt
 
       - name: Build documentation
         run: |