Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/3b8b216: Update to 5.79.0, ghost-cli 1.25.3

library/ghost

@@ -5,12 +5,12 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Austin Burdine <[email protected]> (@acburdine)
 GitRepo: https://github.com/docker-library/ghost.git
 
-Tags: 5.78.0, 5.78, 5, latest
+Tags: 5.79.0, 5.79, 5, latest
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: 4a77eba274347d0835dee9f8bdca17bff44f3815
+GitCommit: 3b8b216b2cba46e1d4df13f4c51bab95de8075d3
 Directory: 5/debian
 
-Tags: 5.78.0-alpine, 5.78-alpine, 5-alpine, alpine
+Tags: 5.79.0-alpine, 5.79-alpine, 5-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: 4a77eba274347d0835dee9f8bdca17bff44f3815
+GitCommit: 3b8b216b2cba46e1d4df13f4c51bab95de8075d3
 Directory: 5/alpine