[2023-LDN] DoIT upgraded from Silver to Gold sponsorship (#13163)

Author: issyl0

data/events/2023-london.yml

@@ -96,15 +96,15 @@ sponsors:
     level: gold
   - id: coralogix
     level: gold
+  - id: doit
+    level: gold
   - id: elastic
     level: gold
   - id: puppet
     level: gold
   # silver sponsors
   - id: mkdev
     level: silver
-  - id: doit
-    level: silver
   - id: checkly
     level: silver
   - id: gitea
@@ -132,7 +132,6 @@ sponsors:
   - id: doxlon
     level: community
 
-
 sponsors_accepted: "yes" # Whether you want "Become a XXX Sponsor!" link
 
 # In this section, list the level of sponsorships and the label to use.