Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/d216858: Update to 4.47.4, ghost-cli 1.21.0
- https://github.com/docker-library/ghost/commit/bd38357: Update to 4.47.4, ghost-cli 1.20.0

library/ghost

@@ -6,10 +6,10 @@ GitRepo: https://github.com/docker-library/ghost.git
 
 Tags: 4.47.4, 4.47, 4, latest
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: 3830ef877edb21be9f3fc237141d04a128e989b4
+GitCommit: d2168581eb77016547ea4643822626bafa03fc46
 Directory: 4/debian
 
 Tags: 4.47.4-alpine, 4.47-alpine, 4-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: 3830ef877edb21be9f3fc237141d04a128e989b4
+GitCommit: d2168581eb77016547ea4643822626bafa03fc46
 Directory: 4/alpine