chore(deps): update docker/setup-buildx-action action to v3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
docker/setup-buildx-action	action	major	v2 -> v3

---

Release Notes

docker/setup-buildx-action (docker/setup-buildx-action)

### [`v3`](https://togithub.com/docker/setup-buildx-action/compare/v2...v3) [Compare Source](https://togithub.com/docker/setup-buildx-action/compare/v2...v3)

---

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 is behind base branch, or you tick the rebase/retry checkbox.

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

---

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

---

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

[github-actions[bot]]

Coverage from tests in ./e2e_test/... for ./consensus/istanbul/... at commit 755b6531374cda574d81502edef7a67ae09833fc

coverage: 48.9% of statements across all listed packages

coverage:  63.0% of statements in consensus/istanbul
coverage:  40.1% of statements in consensus/istanbul/announce
coverage:  54.6% of statements in consensus/istanbul/backend
coverage:   0.0% of statements in consensus/istanbul/backend/backendtest
coverage:  24.3% of statements in consensus/istanbul/backend/internal/replica
coverage:  61.2% of statements in consensus/istanbul/core
coverage:  45.0% of statements in consensus/istanbul/db
coverage:   0.0% of statements in consensus/istanbul/proxy
coverage:  64.2% of statements in consensus/istanbul/uptime
coverage:  51.8% of statements in consensus/istanbul/validator
coverage:  79.2% of statements in consensus/istanbul/validator/random

[github-actions[bot]]

[codecov[bot]]

Codecov Report

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

Comparison is base (35af303) 55.07% compared to head (08bce8a) 55.07%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2234 +/- ## ======================================= Coverage 55.07% 55.07% ======================================= Files 683 683 Lines 114533 114533 ======================================= + Hits 63076 63080 +4 + Misses 47570 47553 -17 - Partials 3887 3900 +13 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.