Update ghost to version v6.12.0 (#4436)

ghost/docker-compose.yml

@@ -8,7 +8,7 @@ services:
       PROXY_AUTH_ADD: "false"
 
   web:
-    image: ghost:6.6.1@sha256:1e243c833aaa518c6f0786037e83ebe3a8567f8aeac0aa71a38f6fe9d7790935
+    image: ghost:6.12.0@sha256:4776e968427b33614f8b8c9e760f68bbffc86394775a9cffa9775cfcb039a417
     restart: on-failure
     user: "1000:1000"
     volumes:

ghost/umbrel-app.yml

@@ -3,7 +3,7 @@ id: ghost
 name: Ghost
 tagline: A platform for creators to publish, grow, and monetize their content
 category: files
-version: "6.6.1"
+version: "6.12.0"
 port: 3368
 description: >-
   Ghost is a powerful, open-source content management system (CMS) primarily designed for professional bloggers, journalists, and content creators. Unlike more traditional CMS platforms like WordPress, which offer a wide range of plugins and customization options, Ghost focuses on providing a streamlined, fast, and minimalist platform that prioritizes the writing and publishing experience. It was initially created with bloggers in mind, but over time, it has evolved to include more features such as membership management, email newsletters, and monetization tools.
@@ -38,11 +38,13 @@ gallery:
   - 7.jpg
 releaseNotes: >-
   This release of Ghost includes several improvements and bug fixes:
-    - Added Banner component to Shade design system
-    - Fixed magic links only being valid for 10 minutes
-    - Fixed activitypub sidebar navigation active state
-    - Fixed outdated dashboard links in design and profile modals
-    - Updated translations for German, Italian, Arabic, and Bulgarian
+    - Added IndexNow integration for faster search engine indexing
+    - Added warning when a post's size exceeds email clients clipping length
+    - Added discovery feeds and explore by topic to the Network tab
+    - Fixed sorting in Growth tab Sources table
+    - Fixed missing member discount data after migrations
+    - Fixed email analytics aggregation issues
+    - Updated translations for Finnish, Swedish, German, French, Portuguese, and Russian
 
 
   Full release notes can be found at https://github.com/TryGhost/Ghost/releases