chore(deps): update activitypub to v1.2.6 (#219)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

compose.yml

@@ -100,7 +100,7 @@ services:
       - ghost_network
 
   activitypub:
-    image: ghcr.io/tryghost/activitypub:1.2.5@sha256:15dab1c0d16f1deace5e261b42519e80739db47c1a4dbb51c6ded01acabd26a0
+    image: ghcr.io/tryghost/activitypub:1.2.6@sha256:0127dea9be75d0ed9c6f8f3909aa5e1f69cc3e1f22d718a49aad28ffdc8b5367
     restart: always
     expose:
       - "8080"
@@ -185,7 +185,7 @@ services:
     tty: true
 
   activitypub-migrate:
-    image: ghcr.io/tryghost/activitypub-migrations:1.2.5@sha256:0e76904770f94744b1c3c9618158abf17f112a37993422c05f3c68e16970f230
+    image: ghcr.io/tryghost/activitypub-migrations:1.2.6@sha256:ba832dc6f6ea77ca84ee3d0308b38bdf135710f92a93d9ffbb4662c297a62e18
     environment:
       MYSQL_DB: mysql://${DATABASE_USER:-ghost}:${DATABASE_PASSWORD:?DATABASE_PASSWORD environment variable is required}@tcp(db:3306)/activitypub
     networks: