chore(deps): update docker/build-push-action action to v6

Author: renovate[bot]

.gitea/workflows/build.yaml

@@ -30,7 +30,7 @@ jobs:
         uses: falti/dotenv-action@v1.1.2
 
       - name: Build and push
-        uses: docker/build-push-action@2cdde995de11925a030ce8070c3d77a52ffcf1c0 # v5
+        uses: docker/build-push-action@4f58ea79222b3b9dc2c8bbdd6debcef730109a75 # v6
         env:
           ACTIONS_RUNTIME_TOKEN: ''
         with: