Fix: update unit test to use real lambda arn

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