Fix: update unit test to use real lambda arn (#1267)

This has to be done because the lambda instrumentation was updated to
extract the account id from the arn present in the lambda context
in this PR: open-telemetry/opentelemetry-python-contrib#2367

python/src/otel/tests/test_otel.py

@@ -59,7 +59,7 @@ def __init__(self, aws_request_id, invoked_function_arn):
 
 MOCK_LAMBDA_CONTEXT = MockLambdaContext(
     aws_request_id="mock_aws_request_id",
-    invoked_function_arn="arn://mock-lambda-function-arn",
+    invoked_function_arn="arn:aws:lambda:us-west-2:123456789012:function:my-function",
 )
 
 MOCK_XRAY_TRACE_ID = 0x5FB7331105E8BB83207FA31D4D9CDB4C