Changed mamba install tdc to pip install, in the test.yml file

.github/workflows/test.yml

@@ -50,7 +50,7 @@ jobs:
         run: python -m pip install --no-deps -e . # `-e` required for correct `coverage` run.
 
       - name: Install test dependencies
-        run: mamba install -c conda-forge pytdc  # Required to run the `test_finetuning.py`
+        run: python -m pip install pytdc  # Required to run the `test_finetuning.py`
 
       - name: Run tests
         run: pytest -m 'not ipu'