Revert chart-testing-cli-version pin; upstream reusable workflow has been fixed

Co-authored-by: f2calv <16097639+f2calv@users.noreply.github.com>
Agent-Logs-Url: https://github.com/f2calv/multi-arch-container-rust/sessions/ab17235b-36ac-4449-848b-490b4ccbb7b0

Author: Copilot

.github/workflows/ci.yml

@@ -56,7 +56,6 @@ jobs:
       chart-registry-username: ${{ github.repository_owner }}
       chart-repository: ${{ github.repository_owner }}/charts/multi-arch-container-rust
       chart-path: charts/multi-arch-container-rust
-      chart-testing-cli-version: v3.11.0
       tag: ${{ needs.versioning.outputs.semVer }}
       push-chart: ${{ github.ref_name == github.event.repository.default_branch }}
     secrets: inherit