enable GIL again for more testing

.github/workflows/test.yml

@@ -93,10 +93,10 @@ jobs:
       - name: Install older AnyIO in Python 3.8
         if: matrix.python-version == '3.8'
         run: uv pip install "anyio[trio]<4.0.0"
-      - name: Set PYTHON_GIL
-        if: endsWith(matrix.python-version, 't')
-        run: |
-          echo "PYTHON_GIL=0" >> "$GITHUB_ENV"
+#      - name: Set PYTHON_GIL
+#        if: endsWith(matrix.python-version, 't')
+#        run: |
+#          echo "PYTHON_GIL=0" >> "$GITHUB_ENV"
       - run: mkdir coverage
       - name: Test
         run: bash scripts/test.sh