Increase min log level to 'Warning' framework namespaces

Jellyfin.Server/Resources/Configuration/logging.json

@@ -1,6 +1,12 @@
 {
     "Serilog": {
-        "MinimumLevel": "Information",
+        "MinimumLevel": {
+            "Default": "Information",
+            "Override": {
+                "Microsoft": "Warning",
+                "System": "Warning"
+            }
+        },
         "WriteTo": [
             {
                 "Name": "Console",