Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/fbf749a: Update to 4.2.0, ghost-cli 1.16.3

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: 4.1.2, 4.1, 4, latest
+Tags: 4.2.0, 4.2, 4, latest
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: 22451f9bc044ff0616546525fcc0e29274f5e35c
+GitCommit: fbf749ae2b8633673ffdc5b97e8e17e4974687aa
 Directory: 4/debian
 
-Tags: 4.1.2-alpine, 4.1-alpine, 4-alpine, alpine
+Tags: 4.2.0-alpine, 4.2-alpine, 4-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: 22451f9bc044ff0616546525fcc0e29274f5e35c
+GitCommit: fbf749ae2b8633673ffdc5b97e8e17e4974687aa
 Directory: 4/alpine
 
 Tags: 3.42.4, 3.42, 3