Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/68735c3: Update to 4.48.3, ghost-cli 1.23.0
- https://github.com/docker-library/ghost/commit/ad7a1ca: Update to 5.12.2, ghost-cli 1.23.0
- https://github.com/docker-library/ghost/commit/ab12a98: Update to 4.48.2, ghost-cli 1.23.0
- https://github.com/docker-library/ghost/commit/7e9db82: Update to 5.12.1, ghost-cli 1.23.0

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: 5.12.0, 5.12, 5, latest
+Tags: 5.12.2, 5.12, 5, latest
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: 166068e0aad26bef6488978eb65ddabe794dd200
+GitCommit: ad7a1cab191b589b7be54594be032ac1e35ac100
 Directory: 5/debian
 
-Tags: 5.12.0-alpine, 5.12-alpine, 5-alpine, alpine
+Tags: 5.12.2-alpine, 5.12-alpine, 5-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: 166068e0aad26bef6488978eb65ddabe794dd200
+GitCommit: ad7a1cab191b589b7be54594be032ac1e35ac100
 Directory: 5/alpine
 
-Tags: 4.48.2, 4.48, 4
+Tags: 4.48.3, 4.48, 4
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: 7b4bc3f80d2d9752a6dea43cc38013b627c3e759
+GitCommit: 68735c33309a74a4ce8fa1f44be5b66bb6eff3ef
 Directory: 4/debian
 
-Tags: 4.48.2-alpine, 4.48-alpine, 4-alpine
+Tags: 4.48.3-alpine, 4.48-alpine, 4-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: 7b4bc3f80d2d9752a6dea43cc38013b627c3e759
+GitCommit: 68735c33309a74a4ce8fa1f44be5b66bb6eff3ef
 Directory: 4/alpine