chore: update rubocop requirement from ~> 1.68.0 to ~> 1.69.1 in /helpers/mysql #3946

Job	Run time
helpers-mysql / ubuntu-latest	1m 33s
propagator-ottrace / ubuntu-latest	1m 23s
helpers-sql-obfuscation / ubuntu-latest	1m 11s
propagator-vitess / ubuntu-latest	1m 17s
propagator-xray / ubuntu-latest	1m 21s
processors-baggage / ubuntu-latest	43s
opentelemetry-resource-detector-azure / ubuntu-latest	1m 19s
opentelemetry-resource-detector-container / ubuntu-latest	1m 12s
opentelemetry-resource-detector-google_cloud_platform / ubuntu-latest	1m 41s
	11m 40s

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