Update ghost

Changes:

- docker-library/ghost@c91b1df: Merge pull request docker-library/ghost#308 from infosiftr/arm64+

Author: docker-library-bot

library/ghost

@@ -6,12 +6,12 @@ GitRepo: https://github.com/docker-library/ghost.git
 
 Tags: 5.1.1, 5.1, 5, latest
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: b72aca608fbecd57cf7692b1cbf0786b18403e05
+GitCommit: c91b1df2d40e9f4c59874cf09706a6d417901f4c
 Directory: 5/debian
 
 Tags: 5.1.1-alpine, 5.1-alpine, 5-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: b72aca608fbecd57cf7692b1cbf0786b18403e05
+GitCommit: c91b1df2d40e9f4c59874cf09706a6d417901f4c
 Directory: 5/alpine
 
 Tags: 4.48.1, 4.48, 4