chore: update rubocop requirement from ~> 1.66.0 to ~> 1.67.0 in /propagator/xray #3677

Job	Run time
helpers-mysql / ubuntu-latest	1m 12s
helpers-sql-obfuscation / ubuntu-latest	1m 8s
processors-baggage / ubuntu-latest	30s
propagator-ottrace / ubuntu-latest	1m 9s
propagator-vitess / ubuntu-latest	1m 7s
propagator-xray / ubuntu-latest	1m 24s
opentelemetry-resource-detector-azure / ubuntu-latest	1m 18s
opentelemetry-resource-detector-container / ubuntu-latest	1m 25s
opentelemetry-resource-detector-google_cloud_platform / ubuntu-latest	1m 34s
	10m 47s

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