chore: update rubocop requirement from ~> 1.66.0 to ~> 1.67.0 in /helpers/mysql #3678

Job	Run time
helpers-mysql / ubuntu-latest	1m 29s
propagator-ottrace / ubuntu-latest	1m 7s
processors-baggage / ubuntu-latest	38s
helpers-sql-obfuscation / ubuntu-latest	1m 14s
propagator-vitess / ubuntu-latest	1m 11s
propagator-xray / ubuntu-latest	1m 20s
opentelemetry-resource-detector-azure / ubuntu-latest	1m 26s
opentelemetry-resource-detector-container / ubuntu-latest	1m 19s
opentelemetry-resource-detector-google_cloud_platform / ubuntu-latest	1m 28s
	11m 12s

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