Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/81b224e: Update to 5.81.1, ghost-cli 1.26.0

library/ghost

@@ -5,12 +5,12 @@ Maintainers: Tianon Gravi <[email protected]> (@tianon),
              Austin Burdine <[email protected]> (@acburdine)
 GitRepo: https://github.com/docker-library/ghost.git
 
-Tags: 5.81.0, 5.81, 5, latest
+Tags: 5.81.1, 5.81, 5, latest
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: 847b8a45a6108ad80d25e53333f65a6f91205659
+GitCommit: 81b224e36c638a8864a1bc4ba952e84de0ae29cb
 Directory: 5/debian
 
-Tags: 5.81.0-alpine, 5.81-alpine, 5-alpine, alpine
+Tags: 5.81.1-alpine, 5.81-alpine, 5-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: 847b8a45a6108ad80d25e53333f65a6f91205659
+GitCommit: 81b224e36c638a8864a1bc4ba952e84de0ae29cb
 Directory: 5/alpine