Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/a4f0ff7: Update to 4.48.5, ghost-cli 1.23.0

library/ghost

@@ -14,12 +14,12 @@ Architectures: amd64, arm32v6, arm32v7, arm64v8
 GitCommit: 463b5935180624197ce2a527775af79501a10051
 Directory: 5/alpine
 
-Tags: 4.48.4, 4.48, 4
+Tags: 4.48.5, 4.48, 4
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: a9a8ed96b2e42133c6b502cc404f873fd64d1284
+GitCommit: a4f0ff7bcdf2861102dff4f94e8c83db9a335ff0
 Directory: 4/debian
 
-Tags: 4.48.4-alpine, 4.48-alpine, 4-alpine
+Tags: 4.48.5-alpine, 4.48-alpine, 4-alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8
-GitCommit: a9a8ed96b2e42133c6b502cc404f873fd64d1284
+GitCommit: a4f0ff7bcdf2861102dff4f94e8c83db9a335ff0
 Directory: 4/alpine