CI: fix subsequent uv commands syncing wrong kernels-data again

Author: danieldk

.github/workflows/test_kernels.yaml

@@ -41,6 +41,10 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
+      - name: Override kernels-data source to local bindings
+        working-directory: ./kernels
+        run: uv add kernels-data --path ../kernels-data/bindings/python --no-sync
+
       - name: Install the project
         working-directory: ./kernels
         run: uv sync --all-extras --dev
@@ -53,10 +57,6 @@ jobs:
         working-directory: ./kernels
         run: uv pip install setuptools
 
-      - name: Install kernels-data from local bindings
-        working-directory: ./kernels
-        run: uv pip install ../kernels-data/bindings/python
-
       - name: Check typing
         working-directory: ./kernels
         run: uv run mypy src/kernels