chore(deps): Bump docker/build-push-action from 6.17.0 to 6.18.0 (docker-mailserver#4500)

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

Author: dependabot[bot]

.github/workflows/generic_build.yml

@@ -80,7 +80,7 @@ jobs:
 
       # NOTE: AMD64 can build within 2 minutes
       - name: 'Build images'
-        uses: docker/build-push-action@v6.17.0
+        uses: docker/build-push-action@v6.18.0
         with:
           context: .
           # Build at least the AMD64 image (which runs against the test suite).

.github/workflows/generic_publish.yml

@@ -67,7 +67,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: 'Build and publish images'
-        uses: docker/build-push-action@v6.17.0
+        uses: docker/build-push-action@v6.18.0
         with:
           context: .
           build-args: |

.github/workflows/generic_test.yml

@@ -43,7 +43,7 @@ jobs:
       # Importing from the cache should create the image within approx 30 seconds:
       # NOTE: `qemu` step is not needed as we only test for AMD64.
       - name: 'Build AMD64 image from cache'
-        uses: docker/build-push-action@v6.17.0
+        uses: docker/build-push-action@v6.18.0
         with:
           context: .
           tags: mailserver-testing:ci

.github/workflows/generic_vulnerability-scan.yml

@@ -42,7 +42,7 @@ jobs:
       # Importing from the cache should create the image within approx 30 seconds:
       # NOTE: `qemu` step is not needed as we only test for AMD64.
       - name: 'Build AMD64 image from cache'
-        uses: docker/build-push-action@v6.17.0
+        uses: docker/build-push-action@v6.18.0
         with:
           context: .
           tags: mailserver-testing:ci