Update test_and_deploy.yml (#275)

Add `nodefaults` channel to prevent from using the `defaults` channel. See [docs](https://docs.conda.io/projects/conda/en/4.6.1/user-guide/tasks/manage-environments.html#:~:text=You%20can%20exclude%20the%20default%20channels%20by%20adding%20nodefaults%20to%20the%20channels%20list.)

.github/workflows/test_and_deploy.yml

@@ -52,7 +52,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
           auto-update-conda: true
-          channels: conda-forge
+          channels: conda-forge,nodefaults
           activate-environment: movement-env
       - uses: neuroinformatics-unit/actions/test@v2
         with: