[dev-v2.10] Bump rancher-webhook to v0.6.4-rc.1

[rancher-pr-and-push-webhook]

Release note for v0.6.4-rc.1

What's Changed

• [release/v0.6] Prevent deletion of local cluster (Update storageos-operator to version 0.3.1 #551) by @dharmit in [release/v0.6] Prevent deletion of local cluster (#551) webhook#592

Full Changelog: rancher/webhook@v0.6.3...v0.6.4-rc.1

Useful links

• Commit comparison: rancher/webhook@v0.6.3...v0.6.4-rc.1
• Release v0.6.3: https://github.com/rancher/webhook/releases/tag/v0.6.3

About this PR

The workflow was triggered by crobby.

[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.

[tomleb]

LGTM

[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.