docs: Fix required versions of DBs

doc/02-Installation.md

@@ -24,20 +24,11 @@ or install [from source](02-Installation.md.d/From-Source.md).
 
 ## Setting up the Database
 
-A MySQL (≥5.5) or MariaDB (≥10.1) database is required to run Icinga for Kubernetes.
-Please follow the steps listed for your target database,
-which guide you through setting up the database and user, and importing the schema.
+A MySQL (≥8.0) or MariaDB (≥10.4) database is required to run Icinga for Kubernetes.
+Please follow the steps, which guide you through setting up the database and user, and importing the schema.
 
 ### Setting up a MySQL or MariaDB Database
 
-If you use a version of MySQL < 5.7 or MariaDB < 10.2, the following server options must be set:
-
-```
-innodb_file_format=barracuda
-innodb_file_per_table=1
-innodb_large_prefix=1
-```
-
 Set up a MySQL database for Icinga for Kubernetes:
 
 ```