CI: simplify venv creation with astral-sh/setup-uv@v6

Author: jorenham

.github/workflows/type_check.yml

@@ -17,15 +17,13 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: astral-sh/setup-uv@v5
+      - uses: astral-sh/setup-uv@v6
         with:
           python-version: "3.11"
+          activate-environment: true
 
       - name: env setup
-        run: |
-          uv venv .venv
-          source .venv/bin/activate
-          uv pip install . numpy mypy
+        run: uv pip install . numpy mypy
 
       - name: run mypy
         run: mypy --no-incremental --cache-dir=/dev/null .