[bitnami/rabbitmq] Migrate deprecated queue_leader_locator configuration

[bpfoster]

Description of the change

When running the Bitnami RabbitMQ helm chart, I observe the following warning logged:

[warning] <0.985.0> Deprecated features: `queue_master_locator`: queue-master-locator is deprecated. queue-leader-locator should be used instead (allowed values are 'client-local' and 'balanced')

This feature looks to be deprecated beginning in RabbitMQ 4.0.

According to the docs, the queue_leader_locator value of min-masters is mapped to queue_leader_locator = balanced.

Benefits

This will update the configuration generated by the chart to use the new, corresponding, configuration for this.

Possible drawbacks

None noted

Applicable issues

• fixes #

Additional information

Checklist

• Chart version bumped in Chart.yaml according to semver. This is not necessary when the changes only affect README.md files.
• Variables are documented in the values.yaml and added to the README.md using readme-generator-for-helm
• Title of the pull request follows this pattern [bitnami/<name_of_the_chart>] Descriptive title
• All commits signed off and in agreement of Developer Certificate of Origin (DCO)

[gongomgra]

Thanks for your contribution!