Update E2E tests to use latest base image version

[AlanGreene]

Changes

Follow-up to https://github.com/tektoncd/dashboard/pull/3466 New base image built and published:

• https://dashboard.dogfooding.tekton.dev/#/namespaces/default/pipelineruns/build-and-push-dashboard-e2e-base-l8294?pipelineTask=git-clone&step=clone
• https://console.cloud.google.com/gcr/images/tekton-releases/global/dogfooding/dashboard-e2e-base@sha256:6f04d184da93a7b043d64c6490c6a82b781f5de62ee33720ce93e345003b29f9/details

/kind misc

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• [ ] Docs included if any changes are user facing
• [ ] Tests included if any functionality added or changed
• [ ] Follows the commit message standard
• [ ] Meets the Tekton contributor standards (including functionality, content, code)
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• [ ] Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

NONE

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