Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/31ebf85: Update to 3.38.1, ghost-cli 1.15.2

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: 3.38.0, 3.38, 3, latest
+Tags: 3.38.1, 3.38, 3, latest
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: 1ab4a679faa41050f3e8a0f25f19eb8c3de2cabc
+GitCommit: 31ebf85ff8b550d7584a2d7c50c8245a68a0a898
 Directory: 3/debian
 
-Tags: 3.38.0-alpine, 3.38-alpine, 3-alpine, alpine
+Tags: 3.38.1-alpine, 3.38-alpine, 3-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: 1ab4a679faa41050f3e8a0f25f19eb8c3de2cabc
+GitCommit: 31ebf85ff8b550d7584a2d7c50c8245a68a0a898
 Directory: 3/alpine
 
 Tags: 2.38.2, 2.38, 2