fix: use UTF8 encoding for webhook JSON (#714)

server/lib/notifications/agents/webhook.ts

@@ -141,7 +141,7 @@ class WebhookAgent
     const payloadString = Buffer.from(
       this.getSettings().options.jsonPayload,
       'base64'
-    ).toString('ascii');
+    ).toString('utf8');
 
     const parsedJSON = JSON.parse(JSON.parse(payloadString));
 

server/routes/settings/notifications.ts

@@ -275,7 +275,7 @@ notificationRoutes.get('/webhook', (_req, res) => {
       ...webhookSettings.options,
       jsonPayload: JSON.parse(
         Buffer.from(webhookSettings.options.jsonPayload, 'base64').toString(
-          'ascii'
+          'utf8'
         )
       ),
     },