chore: optimise code style

src/main/java/com/onixbyte/deltaforceguide/interceptor/GitHubWebhookInterceptor.java

@@ -64,7 +64,7 @@ public class GitHubWebhookInterceptor implements HandlerInterceptor {
 
         var body = req.getBodyString();
         try {
-            var computed = "sha256=" + CryptoUtil.hmacSha256(secret, body);
+            var computed = "sha256=" + CryptoUtil.hmacSha256(body, secret);
 
             if (!MessageDigest.isEqual(
                     computed.getBytes(StandardCharsets.UTF_8),

src/main/java/com/onixbyte/deltaforceguide/service/WebhookService.java

@@ -73,8 +73,7 @@ public class WebhookService {
             return;
         }
 
-        @SuppressWarnings("unchecked")
-        var data = (Map<String, Object>) yaml.load(parsedYaml);
+        var data = yaml.<Map<String, Object>>load(parsedYaml);
         if (data == null) {
             log.warn("Empty YAML block in issue #{}", issue.number());
             return;