Update mysql Docker tag

Author: renovate[bot]

docker-compose.yml

@@ -78,7 +78,7 @@ services:
       - activitypub
 
   mysql:
-    image: mysql:8.0.31
+    image: mysql:8.4.5
     environment:
       - MYSQL_ROOT_PASSWORD=root
       - MYSQL_USER=ghost
@@ -208,7 +208,7 @@ services:
   mysql-testing:
     networks:
       - test_network
-    image: mysql:8.0.31
+    image: mysql:8.4.5
     environment:
       - MYSQL_ROOT_PASSWORD=root
       - MYSQL_USER=ghost

jobs/cleanup-expired-key-value-records/Dockerfile

@@ -1,4 +1,4 @@
-FROM mysql:8.3
+FROM mysql:8.4
 
 COPY cleanup-expired-key-value-records /bin