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

[renovate[bot]]

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

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Configuration

📅 Schedule: Branch creation - "before 4am on Monday" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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This PR has been generated by Mend Renovate. View repository job log here.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.33%. Comparing base (89d6991) to head (1842042).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #590 +/- ## ======================================= Coverage 81.33% 81.33% ======================================= Files 64 64 Lines 2572 2572 ======================================= Hits 2092 2092 Misses 480 480 ```

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