Fix the integ test for kds workflow

Signed-off-by: Souvik Bose <souvbose@amazon.com>

Author: sbose2k21

.github/workflows/kinesis-source-integration-tests.yml

@@ -64,7 +64,7 @@ jobs:
       - name: Run Kinesis Source integration tests
         run: |
           ./gradlew data-prepper-plugins:kinesis-source:integrationTest \
-            -Dtests.kinesis.source.aws.region=us-east-1 --tests KinesisSourceIT
+            -Dtests.kinesis.source.aws.region=${{ secrets.TEST_REGION }} --tests KinesisSourceIT
       - name: Upload Unit Test Results
         if: always()
         uses: actions/upload-artifact@v4