chore(deps): update dependency com.authzed.api:authzed to v1.6.0 (#2988)

| datasource | package                 | from  | to    |
| ---------- | ----------------------- | ----- | ----- |
| maven      | com.authzed.api:authzed | 1.5.4 | 1.6.0 |

Author: renovate[bot]

embedded-spicedb/pom.xml

@@ -15,7 +15,7 @@
 
     <properties>
         <grpc-protobuf.version>1.81.0</grpc-protobuf.version>
-        <authzed.version>1.5.4</authzed.version>
+        <authzed.version>1.6.0</authzed.version>
         <protobuf-java.version>4.35.0</protobuf-java.version>
     </properties>