Update redis chart version no in quickstart-helm.md

[molo76]

redis chart 14.7.1 is no longer available. Updating to latest version. I tested this and it works.

[prmerger-automator[bot]]

@molo76 : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[opbld33]

Learn Build status updates of commit b043f88:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
articles/aks/quickstart-helm.md	:white_check_mark:Succeeded

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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[Jak-MS]

@zr-msft

• Can you review this PR?
• IMPORTANT: When this content is ready to merge, you must add #sign-off in a comment or the approval may get overlooked.

#label:"aq-pr-triaged" @MicrosoftDocs/public-repo-pr-review-team

[ShannonLeavitt]

@zr-msft - Can you review this old PR and determine whether it needs to be closed or merged?

[zr-msft]

Thank you @molo76 for the contribution!

LGTM

#sign-off

[prmerger-automator[bot]]

@molo76 : Thanks for your contribution! The author(s) have been notified to review your proposed change.