Draft: Resolve "Upgrade Redis Chart to version 7.x"

What does this MR do?

bump bundled Redis chart version ( 6.2.16 ) to match present version shipped with Omnibus ( 7.0.15 )

Related issues

• Closes #5098
• Related to Maximize use of arm64 components in a pipeline (#5820)

Author checklist

For general guidance, please follow our Contributing guide.

Required

For anything in this list which will not be completed, please provide a reason in the MR discussion.

• Merge Request Title and Description are up to date, accurate, and descriptive.
• MR targeting the appropriate branch.
• MR has a green pipeline.
• Documentation created/updated.
• Tests added/updated, and test plan for scenarios not covered by automated tests.
• Equivalent MR/issue for omnibus-gitlab opened.

Reviewers checklist

• MR has a green pipeline on https://gitlab.com/gitlab-org/charts/gitlab.
• Consider downstream impact to the Operator, as per evaluating impact from changes to GitLab Chart.

Acceptance criteria

• reported bundled Redis version is at or above 7.0.15 version
• pipeline tests are passing