Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/366a59a: Update to 5.7.1, ghost-cli 1.21.1

library/ghost

@@ -4,14 +4,14 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/ghost.git
 
-Tags: 5.7.0, 5.7, 5, latest
+Tags: 5.7.1, 5.7, 5, latest
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: 0bb440b502415c9fefbae826c5c14fd3d3fde689
+GitCommit: 366a59aff92334c467f8737306c5f0adfe0bb4e8
 Directory: 5/debian
 
-Tags: 5.7.0-alpine, 5.7-alpine, 5-alpine, alpine
+Tags: 5.7.1-alpine, 5.7-alpine, 5-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: 0bb440b502415c9fefbae826c5c14fd3d3fde689
+GitCommit: 366a59aff92334c467f8737306c5f0adfe0bb4e8
 Directory: 5/alpine
 
 Tags: 4.48.2, 4.48, 4