Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/f49e97d: Update to 4.7.0, ghost-cli 1.17.3

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: 4.6.6, 4.6, 4, latest
+Tags: 4.7.0, 4.7, 4, latest
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: b0308244a0690b19cbb8e9c58ab7b30dda410e6e
+GitCommit: f49e97d38c98b8b3838b9ac04ca6c280703e7c49
 Directory: 4/debian
 
-Tags: 4.6.6-alpine, 4.6-alpine, 4-alpine, alpine
+Tags: 4.7.0-alpine, 4.7-alpine, 4-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: b0308244a0690b19cbb8e9c58ab7b30dda410e6e
+GitCommit: f49e97d38c98b8b3838b9ac04ca6c280703e7c49
 Directory: 4/alpine
 
 Tags: 3.42.5, 3.42, 3