[dev-v2.10] rancher-backup 105.0.0+up6.0.0-rc.6 update

[mallardduck]

Issue:

N/A

Problem

Per title, this PR fixes the rancher version annotation.
This is an issue blocking QA from seeing the chart for testing.

Solution

Correct the annotation.

[github-actions]

Validation steps

• Ensure all container images have repository and tag on the same level to ensure that all container images are included in rancher-images.txt which are used by airgap customers.

  Ex:-
    longhorn-controller:
      repository: rancher/hardened-sriov-cni
      tag: v2.6.3-build20230913
  

• Add a 👍 (thumbs up) reaction to this comment once done. CI won't pass without this reaction to the github-action bot's latest validation comment.
• Approve the PR to run the CI check.