Update mysql Docker tag to v8.4.7

Author: renovate[bot]

docker-compose.yml

@@ -80,7 +80,7 @@ services:
       - activitypub
 
   mysql:
-    image: mysql:8.4.6@sha256:869218921e61d6c3c89820955d63cca42971f0e3e6c1e2792247bbd944ebc6e9
+    image: mysql:8.4.7@sha256:b306273d4d36bc1a7f265130c3dd93c0462253af7634203e569add0403a7b273
     environment:
       - MYSQL_ROOT_PASSWORD=root
       - MYSQL_USER=ghost
@@ -222,7 +222,7 @@ services:
   mysql-testing:
     networks:
       - test_network
-    image: mysql:8.4.6@sha256:869218921e61d6c3c89820955d63cca42971f0e3e6c1e2792247bbd944ebc6e9
+    image: mysql:8.4.7@sha256:b306273d4d36bc1a7f265130c3dd93c0462253af7634203e569add0403a7b273
     environment:
       - MYSQL_ROOT_PASSWORD=root
       - MYSQL_USER=ghost

jobs/__template__/docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   mysql-test:
-    image: mysql:8.4.6@sha256:869218921e61d6c3c89820955d63cca42971f0e3e6c1e2792247bbd944ebc6e9
+    image: mysql:8.4.7@sha256:b306273d4d36bc1a7f265130c3dd93c0462253af7634203e569add0403a7b273
     environment:
       MYSQL_ROOT_PASSWORD: root
       MYSQL_DATABASE: __JOB_NAME__