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

This PR contains the following updates:

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

Release Notes

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

### [`v6`](https://togithub.com/docker/build-push-action/compare/v5...v6) [Compare Source](https://togithub.com/docker/build-push-action/compare/v5...v6)

Configuration

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4350pChris / slack-vuesualizer

chore(deps): update docker/build-push-action action to v6 #829

Release Notes

Configuration