Update ghost

Changes:

- docker-library/ghost@51d8f68: Merge pull request docker-library/ghost#428 from locohamster/master
- docker-library/ghost@ecd5118: Merge pull request docker-library/ghost#1 from locohamster/update-to-alpine3.21
- docker-library/ghost@53b2329: Update Dockerfile base image alpine3.20->alpine3.21

Author: docker-library-bot

library/ghost

@@ -12,5 +12,5 @@ Directory: 5/debian
 
 Tags: 5.105.0-alpine, 5.105-alpine, 5-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: fab52d5c943038af09062b995d8a9822483e933e
+GitCommit: 53b2329d1c3da840e9f8f8ce08c60c6f586ec8d3
 Directory: 5/alpine