Do not run mypy on 3.8

Author: niklasf

.github/workflows/test.yml

@@ -38,7 +38,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        python-version: ["3.8", "3.9", "3.10"]
+        python-version: ["3.9", "3.10"]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3