fix: Add venv to Github action

Author: ruivieira

.github/workflows/python-tests.yaml

@@ -27,6 +27,8 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           python -m pip install uv
+          python -m venv .venv
+          source .venv/bin/activate
           if [ -f pyproject.toml ]; then
             uv pip install -e ".[dev,protobuf]"
           else
@@ -35,10 +37,12 @@ jobs:
 
       - name: Generate protobuf stubs
         run: |
+          source .venv/bin/activate
           bash scripts/generate_protos.sh
 
       - name: Run tests with pytest
         run: |
+          source .venv/bin/activate
           pytest tests/ -v --cov=src --cov-report=xml
 
       - name: Upload coverage to Codecov