Use requirements.txt for dependency installation

Author: RyanLettieri

.github/workflows/publish-dts-sdk.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install azure-identity
+          pip install -r requirements.txt
 
       - name: Run the tests
         working-directory: examples/dts