Run Mypy on more recent version in CI

Author: saulshanabrook

.github/workflows/CI.yml

@@ -42,8 +42,6 @@ jobs:
       - uses: astral-sh/setup-uv@v6
         with:
           enable-cache: true
-          # Run on oldest Python version to catch more errors
-          python-version: "3.10"
       - uses: dtolnay/[email protected]
       - uses: Swatinem/rust-cache@v2
       - run: uv sync --extra test --locked