update proto version

Author: BrandonArp

pom.xml

@@ -136,7 +136,7 @@
     <metrics.client.incubator.version>0.13.0</metrics.client.incubator.version>
     <metrics.jvm.extra.version>0.13.1</metrics.jvm.extra.version>
     <metrics.http.extra.version>0.13.1</metrics.http.extra.version>
-    <metrics.aggregator.protocol.version>1.1.0</metrics.aggregator.protocol.version>
+    <metrics.aggregator.protocol.version>1.2.1</metrics.aggregator.protocol.version>
     <mockito.version>5.13.0</mockito.version>
     <netty.version>4.0.56.Final</netty.version>
     <netty.all.version>4.0.21.Final</netty.all.version>