Remove GitHub Action Workflow checkout token: ${{secrets.SUB_MODULE_PAT}}

[medgar-nitric]

To enable Github security dependency analysis feature 'Dependabot' we need to remove the Github secrets tokens so Dependabot can run when making a PR with updated dependencies.

    - name: Checkout
      uses: actions/checkout@v2
      with:
        token: ${{secrets.SUB_MODULE_PAT}}
        submodules: recursive

https://github.com/nitrictech/dotnet-sdk/blob/main/.github/workflows/dotnet-test.yml

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