Bump docker/build-push-action from 6 to 7 (#4122)

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

Author: dependabot[bot]

.github/workflows/docker-dev-test-env.yml

@@ -84,7 +84,7 @@ jobs:
           echo "PETSC_SLEPC_DEBUGGING=no" >> $GITHUB_ENV
 
       - name: Build and push
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           build-args: |
             MPI=${{ matrix.mpi }}

.github/workflows/docker-end-user.yml

@@ -130,7 +130,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Build dolfinx-onbuild
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           build-args: |
             DOLFINX_CMAKE_BUILD_TYPE=RelWithDebInfo
@@ -142,7 +142,7 @@ jobs:
           tags: docker.io/dolfinx/dolfinx-onbuild:${{ env.TAG }}
 
       - name: Build intermediate
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           build-args: |
             DOLFINX_CMAKE_BUILD_TYPE=RelWithDebInfo
@@ -152,7 +152,7 @@ jobs:
           target: intermediate
 
       - name: Build dolfinx
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           build-args: |
             BASEIMAGE=${{ env.BASEIMAGE }}
@@ -163,7 +163,7 @@ jobs:
           tags: docker.io/dolfinx/dolfinx:${{ env.TAG }}
 
       - name: Build lab
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           build-args: |
             BASEIMAGE=${{ env.BASEIMAGE }}