chore(deps): bump docker/setup-buildx-action from 3.12.0 to 4.2.0 (#13)

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 3.12.0 to 4.2.0.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@8d2750c...bb05f3f)

---
updated-dependencies:
- dependency-name: docker/setup-buildx-action
  dependency-version: 4.2.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -46,7 +46,7 @@ jobs:
         uses: docker/setup-qemu-action@96fe6ef7f33517b61c61be40b68a1882f3264fb8 # v4.2.0
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3
+        uses: docker/setup-buildx-action@bb05f3f5519dd87d3ba754cc423b652a5edd6d2c # v4.2.0
 
       - name: Build proxy image (multi-platform, no push)
         uses: docker/build-push-action@10e90e3645eae34f1e60eeb005ba3a3d33f178e8 # v6

.github/workflows/deploy.yml

@@ -32,7 +32,7 @@ jobs:
         uses: docker/setup-qemu-action@96fe6ef7f33517b61c61be40b68a1882f3264fb8 # v4.2.0
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3
+        uses: docker/setup-buildx-action@bb05f3f5519dd87d3ba754cc423b652a5edd6d2c # v4.2.0
 
       - name: Log in to GHCR
         uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0