[bitnami/redis-cluster] Set usePasswordFiles=true by default

[migruiz4]

Description of the change

Sets default value for usePasswordFiles to true.

Benefits

With this change, the chart will mount the secrets as files by default instead of directly setting them into environment variables.

Possible drawbacks

None

Applicable issues

None

Additional information

N/A

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)

[fmulero]

For those users who set the old value usePasswordFile to false, I'd add an entry in the Upgrading README section to mention this change, because the expected behaviour will be different.

[github-actions]

This Pull Request has been automatically marked as "stale" because it has not had recent activity (for 15 days). It will be closed if no further activity occurs. Thank you for your contribution.

[github-actions]

Due to the lack of activity in the last 5 days since it was marked as "stale", we proceed to close this Pull Request. Do not hesitate to reopen it later if necessary.