Updated the environment variables

[ram-msft]

Changed from const to static and readonly // Add your Face subscription key to your environment variables. private static readonly string subscriptionKey = Environment.GetEnvironmentVariable("FACE_SUBSCRIPTION_KEY"); // Add your Face endpoint to your environment variables. private static readonly string faceEndpoint = Environment.GetEnvironmentVariable("FACE_ENDPOINT");

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Does this introduce a breaking change?

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[ ] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

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