chore: Update Shopware 6.7.0 tag to v6.7.0.0-rc4

Author: aragon999

.github/workflows/build-docker-images.yaml

@@ -279,7 +279,7 @@ jobs:
             php-version: "8.3"
             flavour: alpine
             template: https://github.com/shopware/shopware
-          - shopware-version: v6.7.0.0-rc3
+          - shopware-version: v6.7.0.0-rc4
             php-version: "8.3"
             flavour: alpine
             template: https://github.com/shopware/shopware
@@ -463,7 +463,7 @@ jobs:
             php-version: "8.3"
             flavour: debian
             template: https://github.com/shopware/shopware
-          - shopware-version: v6.7.0.0-rc3
+          - shopware-version: v6.7.0.0-rc4
             php-version: "8.3"
             flavour: debian
             template: https://github.com/shopware/shopware