squash: fix test

Author: arielvalentin

instrumentation/aws_lambda/test/opentelemetry/instrumentation_test.rb

@@ -95,7 +95,7 @@
         _(last_span.hex_span_id.size).must_equal 16
         _(last_span.hex_trace_id.size).must_equal 32
         _(last_span.trace_flags.sampled?).must_equal true
-        _(last_span.tracestate.to_h.to_s).must_equal '{"otel"=>"ff40ea9699e62af2-01"}'
+        _(last_span.tracestate.to_h).must_equal { 'otel' => 'ff40ea9699e62af2-01' }
       end
       event_v1['headers'].delete('traceparent')
       event_v1['headers'].delete('tracestate')