Increase cache version to download fixed grid

Author: cschwan

.github/actions/cache-test-data/action.yml

@@ -10,7 +10,7 @@ runs:
       uses: actions/cache@v4
       with:
         path: test-data
-        key: test-data-v26
+        key: test-data-v27
     - name: Download test data if cache miss
       if: steps.cache.outputs.cache-hit != 'true'
       run: |