Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/f76e0b5: Update to 4.29.0, ghost-cli 1.18.1
- https://github.com/docker-library/ghost/commit/14c6c9d: Update to 3.42.8, ghost-cli 1.18.1
- https://github.com/docker-library/ghost/commit/b88e13d: Update to 4.28.0, ghost-cli 1.18.1

library/ghost

@@ -4,22 +4,22 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Joseph Ferguson <[email protected]> (@yosifkit)
 GitRepo: https://github.com/docker-library/ghost.git
 
-Tags: 4.27.2, 4.27, 4, latest
+Tags: 4.29.0, 4.29, 4, latest
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: 4370355a93b9d83fc2501a99fb1ecab728fa33c5
+GitCommit: f76e0b59d3852e13eb275a115be287a8986b4743
 Directory: 4/debian
 
-Tags: 4.27.2-alpine, 4.27-alpine, 4-alpine, alpine
+Tags: 4.29.0-alpine, 4.29-alpine, 4-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: 4370355a93b9d83fc2501a99fb1ecab728fa33c5
+GitCommit: f76e0b59d3852e13eb275a115be287a8986b4743
 Directory: 4/alpine
 
-Tags: 3.42.7, 3.42, 3
+Tags: 3.42.8, 3.42, 3
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: dc322bee823175b1eb97c58af85ef6b9de04aeca
+GitCommit: 14c6c9dc1673c75472eabd7b545fdf4b8dfcf4df
 Directory: 3/debian
 
-Tags: 3.42.7-alpine, 3.42-alpine, 3-alpine
+Tags: 3.42.8-alpine, 3.42-alpine, 3-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: dc322bee823175b1eb97c58af85ef6b9de04aeca
+GitCommit: 14c6c9dc1673c75472eabd7b545fdf4b8dfcf4df
 Directory: 3/alpine