Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/9a12514: Update to 2.21.0, ghost-cli 1.10.0
- https://github.com/docker-library/ghost/commit/39215d7: Update to 2.20.1, ghost-cli 1.10.0
- https://github.com/docker-library/ghost/commit/bc588b8: Update to 1.25.7, ghost-cli 1.10.0

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: 2.20.1, 2.20, 2, latest
+Tags: 2.21.0, 2.21, 2, latest
 Architectures: amd64, arm32v7, arm64v8, ppc64le, s390x
-GitCommit: 2fd94097ba5a9690401cb8d52c3319f8dd78d0a1
+GitCommit: 9a12514dcb26aa9ec2620cb4b1f0991f10396a89
 Directory: 2/debian
 
-Tags: 2.20.1-alpine, 2.20-alpine, 2-alpine, alpine
+Tags: 2.21.0-alpine, 2.21-alpine, 2-alpine, alpine
 Architectures: amd64, arm32v6, arm64v8, i386, ppc64le, s390x
-GitCommit: 2fd94097ba5a9690401cb8d52c3319f8dd78d0a1
+GitCommit: 9a12514dcb26aa9ec2620cb4b1f0991f10396a89
 Directory: 2/alpine
 
 Tags: 1.25.7, 1.25, 1
 Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: c4b0064aa0ef96e7fea06bbbd41ab82722a7f80c
+GitCommit: bc588b8dd2c412c23e352b6e8eb53e0025ef4726
 Directory: 1/debian
 
 Tags: 1.25.7-alpine, 1.25-alpine, 1-alpine
 Architectures: amd64, arm32v6, arm64v8, i386, ppc64le, s390x
-GitCommit: c4b0064aa0ef96e7fea06bbbd41ab82722a7f80c
+GitCommit: bc588b8dd2c412c23e352b6e8eb53e0025ef4726
 Directory: 1/alpine