added pip install protobuf unittests yml

Signed-off-by: dafnapension <[email protected]>

Author: dafnapension

.github/workflows/library_tests.yml

@@ -37,6 +37,7 @@ jobs:
     - run: curl -LsSf https://astral.sh/uv/install.sh | sh
     - run: uv pip install --upgrade --system torch --index-url https://download.pytorch.org/whl/cpu
     - run: uv pip install --system -c constraints.txt -e ".[tests]"
+    - run: uv pip install protobuf
     - run: |
         pip install --only-binary :all: spacy