chore(deps): update docker/build-push-action action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker/build-push-action	action	major	v5 -> v6

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Release Notes

docker/build-push-action (docker/build-push-action)

v6

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[justinhynes]

Closing this PR. In the near-ish future, we will not be building a Docker image on pushes to the main (master) branch of the Credentials repo. The public Dockerfile that is part of this repo will be going away and this GHA will no longer be needed.

I don't see a need to update the version of the action.

[renovate]

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