Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/166068e: Update to 5.12.0, ghost-cli 1.22.0

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: 5.11.0, 5.11, 5, latest
+Tags: 5.12.0, 5.12, 5, latest
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: 0ee99f6ec473ee6c8e41c1b38beb6a5e7df1a6f6
+GitCommit: 166068e0aad26bef6488978eb65ddabe794dd200
 Directory: 5/debian
 
-Tags: 5.11.0-alpine, 5.11-alpine, 5-alpine, alpine
+Tags: 5.12.0-alpine, 5.12-alpine, 5-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: 0ee99f6ec473ee6c8e41c1b38beb6a5e7df1a6f6
+GitCommit: 166068e0aad26bef6488978eb65ddabe794dd200
 Directory: 5/alpine
 
 Tags: 4.48.2, 4.48, 4