🎨 Add missing shell config

Author: flaxel

action.yml

@@ -39,10 +39,12 @@ runs:
       uses: actions/setup-python@v5
 
     - name: Install python dependencies
+      shell: bash
       run: |
         python -m pip install -r requirements.txt
 
     - name: Find flaky tests and write to result file
+      shell: bash
       run: |
         python find_flaky_tests.py --slack-channel ${{ inputs.slack-channel-id }} --auth-token "${{ secrets.token }}" --prefix ${{ inputs.prefix }} ${{ inputs.repository }} ${{ inputs.branch }} > flaky_tests.json