Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/aed7ba7: Update to 3.4.0, ghost-cli 1.13.1

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: 3.3.0, 3.3, 3, latest
+Tags: 3.4.0, 3.4, 3, latest
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: aeed5c9122e22c71f321c36f11f8794b3915dce5
+GitCommit: aed7ba7762d70d8bfe17d9250e7d06d93647d576
 Directory: 3/debian
 
-Tags: 3.3.0-alpine, 3.3-alpine, 3-alpine, alpine
+Tags: 3.4.0-alpine, 3.4-alpine, 3-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: aeed5c9122e22c71f321c36f11f8794b3915dce5
+GitCommit: aed7ba7762d70d8bfe17d9250e7d06d93647d576
 Directory: 3/alpine
 
 Tags: 2.38.0, 2.38, 2