Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/e33951b: Update to 4.26.1, ghost-cli 1.18.1
- https://github.com/docker-library/ghost/commit/569ac73: Update to 4.26.0, ghost-cli 1.18.1
- https://github.com/docker-library/ghost/commit/c341c81: Update to 4.25.1, ghost-cli 1.18.1

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: 4.25.0, 4.25, 4, latest
+Tags: 4.26.1, 4.26, 4, latest
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: 6cad1cd6719b1696553f5d46d3a165c2f43ca8a5
+GitCommit: e33951b7c1f578670a84fe8a36a17c541eb7139a
 Directory: 4/debian
 
-Tags: 4.25.0-alpine, 4.25-alpine, 4-alpine, alpine
+Tags: 4.26.1-alpine, 4.26-alpine, 4-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: 6cad1cd6719b1696553f5d46d3a165c2f43ca8a5
+GitCommit: e33951b7c1f578670a84fe8a36a17c541eb7139a
 Directory: 4/alpine
 
 Tags: 3.42.7, 3.42, 3