chore(deps): bump docker/build-push-action from 2.5.0 to 2.6.1 (#2068)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2.5.0 to 2.6.1.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v2.5.0...v2.6.1)

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

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

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

.github/workflows/default_on_push.yml

@@ -33,7 +33,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-buildx-
       - name: Build image locally
-        uses: docker/build-push-action@v2.5.0
+        uses: docker/build-push-action@v2.6.1
         with:
           builder: ${{ steps.buildx.outputs.name }}
           context: .
@@ -98,7 +98,7 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build images locally
-        uses: docker/build-push-action@v2.5.0
+        uses: docker/build-push-action@v2.6.1
         with:
           builder: ${{ steps.buildx.outputs.name }}
           context: .

.github/workflows/scheduled_builds.yml

@@ -38,7 +38,7 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build image locally
-        uses: docker/build-push-action@v2.5.0
+        uses: docker/build-push-action@v2.6.1
         with:
           builder: ${{ steps.buildx.outputs.name }}
           context: .

.github/workflows/test_merge_requests.yml

@@ -32,7 +32,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-buildx-
       - name: Build images locally
-        uses: docker/build-push-action@v2.5.0
+        uses: docker/build-push-action@v2.6.1
         with:
           builder: ${{ steps.buildx.outputs.name }}
           context: .
@@ -44,7 +44,7 @@ jobs:
           tags: mailserver-testing:ci
           cache-to: type=local,dest=/tmp/.buildx-cache
       - name: Build image for test suit
-        uses: docker/build-push-action@v2.5.0
+        uses: docker/build-push-action@v2.6.1
         with:
           builder: ${{ steps.buildx.outputs.name }}
           context: .