fix the notebook_paths references in validate-notebooks (#21)

**Checklist:**

- [ ] **Commit Message Formatting**: Commit titles and messages follow guidelines in the [conventional commits](https://www.conventionalcommits.org/en/v1.0.0/#summary).
- [ ] [Changelog](https://github.com/instructlab/ci-actions/blob/main/CHANGELOG.md) updated with breaking and/or notable changes for the next minor release.
- [ ] Documentation has been added and/or updated, if applicable.
- [ ] Unit tests have been added and/or updated. (If this is not applicable, please provide a justification.)
- [ ] Integration testing has been performed, if applicable

## Description of this Change




Approved-by: courtneypacheco

Approved-by: ktdreyer

Author: mergify[bot]

actions/validate-notebooks/action.yml

@@ -16,4 +16,4 @@ runs:
       run: pip install nbformat
     - name: Validate Notebooks
       shell: bash
-      run: python ${{ github.action_path }}/validate.py $notebook_paths ${{ inputs.path }}
+      run: python ${{ github.action_path }}/validate.py ${{ inputs.path }}

actions/validate-notebooks/validate-notebooks.md

@@ -28,5 +28,5 @@ jobs:
       - name: Validate Jupyter Notebooks
         uses: ./ci-actions/actions/validate-notebooks
         with:
-          notebook_paths: "notebooks/"
+          path: "notebooks/"
 ```