remove manual docker add - should be included via testcontainers dependency

Author: iQuxLE

.github/workflows/test-upstream.yaml

@@ -128,7 +128,7 @@ jobs:
       # the cache will still speedup the rest of the installation
       - name: install linkml
         working-directory: linkml
-        run: uv sync --all-groups && uv add docker
+        run: uv sync --all-groups
 
       - name: print linkml-runtime version
         working-directory: linkml