fix: switch to sarama's new consumer group rebalance strategy setting #12064
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Sarama recently changed the consumer group rebalance strategy setting. I think telegraf updated to a version that uses the new setting in #11980. This PR uses telegraf's existing setting with the new sarama setting.
The old setting is deprecated but it is backward compatible
See IBM/sarama#2352
Although it's backward compatible, sarama logs that a deprecated setting is used, so it is useful to switch to the new setting.
The new setting allows consumers to choose more than one strategy. We may need to add a similar setting to telegraf in the future so users of inputs.kafka can choose which strategies they want instead of being limited to one.