Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/5a87e57: Update to 3.40.5, ghost-cli 1.15.3

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: 3.40.4, 3.40, 3, latest
+Tags: 3.40.5, 3.40, 3, latest
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: 48419dff4c61427f9789b44c5522559a1cc3b2e2
+GitCommit: 5a87e57daeff91831cece198aee121f7a1811199
 Directory: 3/debian
 
-Tags: 3.40.4-alpine, 3.40-alpine, 3-alpine, alpine
+Tags: 3.40.5-alpine, 3.40-alpine, 3-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: 48419dff4c61427f9789b44c5522559a1cc3b2e2
+GitCommit: 5a87e57daeff91831cece198aee121f7a1811199
 Directory: 3/alpine
 
 Tags: 2.38.2, 2.38, 2