Fixing more warnings

[jsimonsmartsheet]

I pulled this and ran dotnet build on the root directory with the solution .sln file and the test project failed to compile

jobs:
  publish-nuget:
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
    - uses: actions/checkout@v3
    - name: Setup .Net Core
      uses: actions/setup-dotnet@v2
      with:
        dotnet-version: '8.0.x'
    - name: Install Dependencies
      run: dotnet restore
    - name: Build
      working-directory: ./smartsheet-csharp-sdk <---- only builds sdk, not the tests or docs, which fail
      run: dotnet build --configuration Release --no-restore

you can switch this to working-directory: ./ in main.yml and see the pipeline fail