(#1619) mysq::db: update charset/collate to utf8mb3/utf8mb3_general_ci

Ages ago, MySQL and MariaDB switched their default from UTF8 to UTF8MB3.
This PR reflects this change.

Author: bastelfreak

Diff for: manifests/db.pp

@@ -51,8 +51,8 @@
   Variant[String, Sensitive[String]]             $password,
   Optional[Array[String[1]]]                     $tls_options     = undef,
   String                                         $dbname          = $name,
-  String[1]                                      $charset         = 'utf8',
-  String[1]                                      $collate         = 'utf8_general_ci',
+  String[1]                                      $charset         = 'utf8mb3',
+  String[1]                                      $collate         = 'utf8mb3_general_ci',
   String[1]                                      $host            = 'localhost',
   Variant[String[1], Array[String[1]]]           $grant           = 'ALL',
   Optional[Variant[String[1], Array[String[1]]]] $grant_options   = undef,