v3.4.2 -- internal CI updates only

🧹 Chores

• Update docker/login-action digest to 3b8fed7 by @renovate in #67
• Update docker/metadata-action digest to 70b2cdc by @renovate in #68
• Update docker/build-push-action digest to 5cd11c3 by @renovate in #66
• Update docker/setup-buildx-action digest to b467d6a by @renovate in #65

Full Changelog: v3.4.1...v3.4.2