Update verification metadata

Author: Yeregorix

gradle/verification-metadata.xml

@@ -928,6 +928,9 @@
          <artifact name="adventure-bom-4.21.0.module">
             <sha256 value="ea8520de222b95a774896d5ba89b456ca1d0b3bf9165b3ecc8ec2f2d766128f3" origin="Generated by Gradle"/>
          </artifact>
+         <artifact name="adventure-bom-4.21.0.pom">
+            <sha256 value="7e9b8fc45d74c863276f2e36c346b34edf91d94246c46823471bf8c358657a74" origin="Generated by Gradle"/>
+         </artifact>
       </component>
       <component group="net.kyori" name="adventure-key" version="4.16.0">
          <artifact name="adventure-key-4.16.0-javadoc.jar">