fix the SaslConfig type to compile with the updated library

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

.changeset/healthy-crabs-collect.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-kafka-backend': patch
+---
+
+Internal tweak to adapt to `kafkajs` 2.2.3

plugins/kafka-backend/src/types/types.ts

@@ -25,8 +25,19 @@ export interface ClusterDetails {
 
 export type SslConfig = ConnectionOptions | boolean;
 
-export type SaslConfig = {
-  mechanism: 'plain' | 'scram-sha-256' | 'scram-sha-512';
-  username: string;
-  password: string;
-};
+export type SaslConfig =
+  | {
+      mechanism: 'plain';
+      username: string;
+      password: string;
+    }
+  | {
+      mechanism: 'scram-sha-256';
+      username: string;
+      password: string;
+    }
+  | {
+      mechanism: 'scram-sha-512';
+      username: string;
+      password: string;
+    };