[VILNIUS-2026] Update sponsors

Author: shvytejimas

data/events/2026/vilnius/main.yml

@@ -110,4 +110,10 @@ sponsors:
   - id: devopsinshorts
     level: community
   - id: cnlatvia
-    level: community
+    level: community
+  - id: kubeevents
+    level: community
+  - id: sdtp
+    level: community
+  - id: oxylabs
+    level: gold