Bump docker/build-push-action from 6 to 7

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6 to 7.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v6...v7)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -171,7 +171,7 @@ jobs:
       - name: 🧰 Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: 🏗️ Build Docker image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: false
@@ -186,7 +186,7 @@ jobs:
       - name: 🧰 Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: 🏗️ Build browser Docker image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: browser/
           push: false
@@ -266,7 +266,7 @@ jobs:
           images: |
             ghcr.io/${{ github.repository }}
       - name: 🚀 Build and push image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: true
@@ -304,7 +304,7 @@ jobs:
           images: |
             ghcr.io/${{ github.repository }}/browser
       - name: 🚀 Build and push image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: browser/
           push: true